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6bf7aab6 | 1 | @c This is part of the Emacs manual. |
c2c6918d | 2 | @c Copyright (C) 1985, 86, 87, 93, 94, 95, 97, 2000, 2001 |
284983bd | 3 | @c Free Software Foundation, Inc. |
6bf7aab6 DL |
4 | @c See file emacs.texi for copying conditions. |
5 | @iftex | |
6 | @chapter Miscellaneous Commands | |
7 | ||
8 | This chapter contains several brief topics that do not fit anywhere | |
9 | else: reading netnews, running shell commands and shell subprocesses, | |
10 | using a single shared Emacs for utilities that expect to run an editor | |
11 | as a subprocess, printing hardcopy, sorting text, narrowing display to | |
12 | part of the buffer, editing double-column files and binary files, saving | |
13 | an Emacs session for later resumption, emulating other editors, and | |
14 | various diversions and amusements. | |
15 | ||
16 | @end iftex | |
17 | @node Gnus, Shell, Calendar/Diary, Top | |
18 | @section Gnus | |
19 | @cindex Gnus | |
20 | @cindex reading netnews | |
21 | ||
22 | Gnus is an Emacs package primarily designed for reading and posting | |
23 | Usenet news. It can also be used to read and respond to messages from a | |
24 | number of other sources---mail, remote directories, digests, and so on. | |
25 | ||
26 | Here we introduce Gnus and describe several basic features. | |
27 | @ifinfo | |
28 | For full details, see @ref{Top, Gnus,, gnus, The Gnus Manual}. | |
29 | @end ifinfo | |
30 | @iftex | |
31 | For full details on Gnus, type @kbd{M-x info} and then select the Gnus | |
32 | manual. | |
33 | @end iftex | |
34 | ||
35 | @findex gnus | |
36 | To start Gnus, type @kbd{M-x gnus @key{RET}}. | |
37 | ||
38 | @menu | |
39 | * Buffers of Gnus:: The group, summary, and article buffers. | |
40 | * Gnus Startup:: What you should know about starting Gnus. | |
41 | * Summary of Gnus:: A short description of the basic Gnus commands. | |
42 | @end menu | |
43 | ||
44 | @node Buffers of Gnus | |
45 | @subsection Gnus Buffers | |
46 | ||
47 | As opposed to most normal Emacs packages, Gnus uses a number of | |
48 | different buffers to display information and to receive commands. The | |
49 | three buffers users spend most of their time in are the @dfn{group | |
177c0ea7 | 50 | buffer}, the @dfn{summary buffer} and the @dfn{article buffer}. |
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51 | |
52 | The @dfn{group buffer} contains a list of groups. This is the first | |
53 | buffer Gnus displays when it starts up. It normally displays only the | |
54 | groups to which you subscribe and that contain unread articles. Use | |
55 | this buffer to select a specific group. | |
56 | ||
57 | The @dfn{summary buffer} lists one line for each article in a single | |
58 | group. By default, the author, the subject and the line number are | |
59 | displayed for each article, but this is customizable, like most aspects | |
60 | of Gnus display. The summary buffer is created when you select a group | |
61 | in the group buffer, and is killed when you exit the group. Use this | |
62 | buffer to select an article. | |
63 | ||
64 | The @dfn{article buffer} displays the article. In normal Gnus usage, | |
65 | you don't select this buffer---all useful article-oriented commands work | |
66 | in the summary buffer. But you can select the article buffer, and | |
67 | execute all Gnus commands from that buffer, if you want to. | |
68 | ||
69 | @node Gnus Startup | |
70 | @subsection When Gnus Starts Up | |
71 | ||
72 | At startup, Gnus reads your @file{.newsrc} news initialization file | |
73 | and attempts to communicate with the local news server, which is a | |
74 | repository of news articles. The news server need not be the same | |
75 | computer you are logged in on. | |
76 | ||
77 | If you start Gnus and connect to the server, but do not see any | |
78 | newsgroups listed in the group buffer, type @kbd{L} or @kbd{A k} to get | |
79 | a listing of all the groups. Then type @kbd{u} to toggle | |
80 | subscription to groups. | |
81 | ||
82 | The first time you start Gnus, Gnus subscribes you to a few selected | |
83 | groups. All other groups start out as @dfn{killed groups} for you; you | |
84 | can list them with @kbd{A k}. All new groups that subsequently come to | |
85 | exist at the news server become @dfn{zombie groups} for you; type @kbd{A | |
86 | z} to list them. You can subscribe to a group shown in these lists | |
87 | using the @kbd{u} command. | |
88 | ||
89 | When you quit Gnus with @kbd{q}, it automatically records in your | |
90 | @file{.newsrc} and @file{.newsrc.eld} initialization files the | |
91 | subscribed or unsubscribed status of all groups. You should normally | |
92 | not edit these files manually, but you may if you know how. | |
93 | ||
94 | @node Summary of Gnus | |
95 | @subsection Summary of Gnus Commands | |
96 | ||
021037cb | 97 | Reading news is a two-step process: |
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98 | |
99 | @enumerate | |
100 | @item | |
101 | Choose a group in the group buffer. | |
102 | ||
103 | @item | |
104 | Select articles from the summary buffer. Each article selected is | |
105 | displayed in the article buffer in a large window, below the summary | |
106 | buffer in its small window. | |
107 | @end enumerate | |
108 | ||
109 | Each Gnus buffer has its own special commands; however, the meanings | |
110 | of any given key in the various Gnus buffers are usually analogous, even | |
111 | if not identical. Here are commands for the group and summary buffers: | |
112 | ||
113 | @table @kbd | |
114 | @kindex q @r{(Gnus Group mode)} | |
115 | @findex gnus-group-exit | |
116 | @item q | |
117 | In the group buffer, update your @file{.newsrc} initialization file | |
118 | and quit Gnus. | |
119 | ||
120 | In the summary buffer, exit the current group and return to the | |
121 | group buffer. Thus, typing @kbd{q} twice quits Gnus. | |
122 | ||
123 | @kindex L @r{(Gnus Group mode)} | |
124 | @findex gnus-group-list-all-groups | |
125 | @item L | |
126 | In the group buffer, list all the groups available on your news | |
127 | server (except those you have killed). This may be a long list! | |
128 | ||
129 | @kindex l @r{(Gnus Group mode)} | |
130 | @findex gnus-group-list-groups | |
131 | @item l | |
132 | In the group buffer, list only the groups to which you subscribe and | |
133 | which contain unread articles. | |
134 | ||
135 | @kindex u @r{(Gnus Group mode)} | |
136 | @findex gnus-group-unsubscribe-current-group | |
137 | @cindex subscribe groups | |
138 | @cindex unsubscribe groups | |
139 | @item u | |
140 | In the group buffer, unsubscribe from (or subscribe to) the group listed | |
141 | in the line that point is on. When you quit Gnus by typing @kbd{q}, | |
142 | Gnus lists in your @file{.newsrc} file which groups you have subscribed | |
143 | to. The next time you start Gnus, you won't see this group, | |
144 | because Gnus normally displays only subscribed-to groups. | |
145 | ||
146 | @kindex C-k @r{(Gnus)} | |
147 | @findex gnus-group-kill-group | |
148 | @item C-k | |
149 | In the group buffer, ``kill'' the current line's group---don't | |
150 | even list it in @file{.newsrc} from now on. This affects future | |
151 | Gnus sessions as well as the present session. | |
152 | ||
153 | When you quit Gnus by typing @kbd{q}, Gnus writes information | |
154 | in the file @file{.newsrc} describing all newsgroups except those you | |
155 | have ``killed.'' | |
156 | ||
157 | @kindex SPC @r{(Gnus)} | |
158 | @findex gnus-group-read-group | |
159 | @item @key{SPC} | |
160 | In the group buffer, select the group on the line under the cursor | |
161 | and display the first unread article in that group. | |
162 | ||
163 | @need 1000 | |
177c0ea7 | 164 | In the summary buffer, |
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165 | |
166 | @itemize @bullet | |
167 | @item | |
168 | Select the article on the line under the cursor if none is selected. | |
169 | ||
170 | @item | |
171 | Scroll the text of the selected article (if there is one). | |
172 | ||
173 | @item | |
174 | Select the next unread article if at the end of the current article. | |
175 | @end itemize | |
176 | ||
177 | Thus, you can move through all the articles by repeatedly typing @key{SPC}. | |
178 | ||
179 | @kindex DEL @r{(Gnus)} | |
180 | @item @key{DEL} | |
181 | In the group buffer, move point to the previous group containing | |
182 | unread articles. | |
183 | ||
184 | @findex gnus-summary-prev-page | |
185 | In the summary buffer, scroll the text of the article backwards. | |
186 | ||
187 | @kindex n @r{(Gnus)} | |
188 | @findex gnus-group-next-unread-group | |
189 | @findex gnus-summary-next-unread-article | |
190 | @item n | |
191 | Move point to the next unread group, or select the next unread article. | |
192 | ||
193 | @kindex p @r{(Gnus)} | |
194 | @findex gnus-group-prev-unread-group | |
195 | @findex gnus-summary-prev-unread-article | |
196 | @item p | |
197 | Move point to the previous unread group, or select the previous | |
198 | unread article. | |
199 | ||
200 | @kindex C-n @r{(Gnus Group mode)} | |
201 | @findex gnus-group-next-group | |
202 | @kindex C-p @r{(Gnus Group mode)} | |
203 | @findex gnus-group-prev-group | |
204 | @kindex C-n @r{(Gnus Summary mode)} | |
205 | @findex gnus-summary-next-subject | |
206 | @kindex C-p @r{(Gnus Summary mode)} | |
207 | @findex gnus-summary-prev-subject | |
208 | @item C-n | |
209 | @itemx C-p | |
210 | Move point to the next or previous item, even if it is marked as read. | |
211 | This does not select the article or group on that line. | |
212 | ||
213 | @kindex s @r{(Gnus Summary mode)} | |
214 | @findex gnus-summary-isearch-article | |
215 | @item s | |
216 | In the summary buffer, do an incremental search of the current text in | |
217 | the article buffer, just as if you switched to the article buffer and | |
218 | typed @kbd{C-s}. | |
219 | ||
220 | @kindex M-s @r{(Gnus Summary mode)} | |
221 | @findex gnus-summary-search-article-forward | |
222 | @item M-s @var{regexp} @key{RET} | |
223 | In the summary buffer, search forward for articles containing a match | |
224 | for @var{regexp}. | |
225 | ||
226 | @end table | |
227 | ||
228 | @ignore | |
229 | @node Where to Look | |
230 | @subsection Where to Look Further | |
231 | ||
232 | @c Too many references to the name of the manual if done with xref in TeX! | |
233 | Gnus is powerful and customizable. Here are references to a few | |
234 | @ifinfo | |
235 | additional topics: | |
236 | ||
237 | @end ifinfo | |
238 | @iftex | |
239 | additional topics in @cite{The Gnus Manual}: | |
240 | ||
241 | @itemize @bullet | |
242 | @item | |
243 | Follow discussions on specific topics.@* | |
244 | See section ``Threading.'' | |
245 | ||
246 | @item | |
247 | Read digests. See section ``Document Groups.'' | |
248 | ||
249 | @item | |
250 | Refer to and jump to the parent of the current article.@* | |
251 | See section ``Finding the Parent.'' | |
252 | ||
253 | @item | |
254 | Refer to articles by using Message-IDs included in the messages.@* | |
255 | See section ``Article Keymap.'' | |
256 | ||
257 | @item | |
258 | Save articles. See section ``Saving Articles.'' | |
259 | ||
260 | @item | |
261 | Have Gnus score articles according to various criteria, like author | |
262 | name, subject, or string in the body of the articles.@* | |
263 | See section ``Scoring.'' | |
264 | ||
265 | @item | |
266 | Send an article to a newsgroup.@* | |
267 | See section ``Composing Messages.'' | |
268 | @end itemize | |
269 | @end iftex | |
270 | @ifinfo | |
271 | @itemize @bullet | |
272 | @item | |
273 | Follow discussions on specific topics.@* | |
274 | @xref{Threading, , Reading Based on Conversation Threads, | |
275 | gnus, The Gnus Manual}. | |
276 | ||
277 | @item | |
278 | Read digests. @xref{Document Groups, , , gnus, The Gnus Manual}. | |
279 | ||
280 | @item | |
281 | Refer to and jump to the parent of the current article.@* | |
282 | @xref{Finding the Parent, , , gnus, The Gnus Manual}. | |
283 | ||
284 | @item | |
285 | Refer to articles by using Message-IDs included in the messages.@* | |
286 | @xref{Article Keymap, , , gnus, The Gnus Manual}. | |
287 | ||
288 | @item | |
289 | Save articles. @xref{Saving Articles, , , gnus, The Gnus Manual}. | |
290 | ||
291 | @item | |
292 | Have Gnus score articles according to various criteria, like author | |
293 | name, subject, or string in the body of the articles.@* | |
177c0ea7 | 294 | @xref{Scoring, , , gnus, The Gnus Manual}. |
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295 | |
296 | @item | |
297 | Send an article to a newsgroup.@* | |
298 | @xref{Composing Messages, , , gnus, The Gnus Manual}. | |
299 | @end itemize | |
300 | @end ifinfo | |
301 | @end ignore | |
302 | ||
303 | @node Shell, Emacs Server, Gnus, Top | |
304 | @section Running Shell Commands from Emacs | |
305 | @cindex subshell | |
306 | @cindex shell commands | |
307 | ||
308 | Emacs has commands for passing single command lines to inferior shell | |
bd4af791 | 309 | processes; it can also run a shell interactively with input and output |
df9d7630 | 310 | to an Emacs buffer named @samp{*shell*} or run a shell inside a terminal |
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311 | emulator window. |
312 | ||
313 | There is a shell implemented entirely in Emacs, documented in a separate | |
fc98b4ba | 314 | manual. @xref{Top,Eshell,Eshell, eshell, Eshell: The Emacs Shell}. |
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315 | |
316 | @table @kbd | |
317 | @item M-! @var{cmd} @key{RET} | |
318 | Run the shell command line @var{cmd} and display the output | |
319 | (@code{shell-command}). | |
320 | @item M-| @var{cmd} @key{RET} | |
321 | Run the shell command line @var{cmd} with region contents as input; | |
322 | optionally replace the region with the output | |
323 | (@code{shell-command-on-region}). | |
324 | @item M-x shell | |
325 | Run a subshell with input and output through an Emacs buffer. | |
326 | You can then give commands interactively. | |
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327 | @item M-x term |
328 | Run a subshell with input and output through an Emacs buffer. | |
329 | You can then give commands interactively. | |
330 | Full terminal emulation is available. | |
bd4af791 DL |
331 | @item M-x eshell |
332 | @findex eshell | |
333 | Start the Emacs shell. | |
6bf7aab6 DL |
334 | @end table |
335 | ||
336 | @menu | |
337 | * Single Shell:: How to run one shell command and return. | |
338 | * Interactive Shell:: Permanent shell taking input via Emacs. | |
339 | * Shell Mode:: Special Emacs commands used with permanent shell. | |
340 | * History: Shell History. Repeating previous commands in a shell buffer. | |
df9d7630 | 341 | * Directory Tracking:: Keeping track when the subshell changes directory. |
6bf7aab6 | 342 | * Options: Shell Options. Options for customizing Shell mode. |
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343 | * Terminal emulator:: An Emacs window as a terminal emulator. |
344 | * Term Mode:: Special Emacs commands used in Term mode. | |
345 | * Paging in Term:: Paging in the terminal emulator. | |
6bf7aab6 DL |
346 | * Remote Host:: Connecting to another computer. |
347 | @end menu | |
348 | ||
349 | @node Single Shell | |
350 | @subsection Single Shell Commands | |
351 | ||
352 | @kindex M-! | |
353 | @findex shell-command | |
354 | @kbd{M-!} (@code{shell-command}) reads a line of text using the | |
355 | minibuffer and executes it as a shell command in a subshell made just | |
356 | for that command. Standard input for the command comes from the null | |
fc98b4ba RS |
357 | device. If the shell command produces any output, the output appears |
358 | either in the echo area (if it is short), or in an Emacs buffer named | |
359 | @samp{*Shell Command Output*}, which is displayed in another window | |
d408f8d0 RS |
360 | but not selected (if the output is long). |
361 | ||
362 | For instance, one way to decompress a file @file{foo.gz} from Emacs | |
363 | is to type @kbd{M-! gunzip foo.gz @key{RET}}. That shell command | |
364 | normally creates the file @file{foo} and produces no terminal output. | |
365 | ||
366 | A numeric argument, as in @kbd{M-1 M-!}, says to insert terminal | |
367 | output into the current buffer instead of a separate buffer. It puts | |
368 | point before the output, and sets the mark after the output. For | |
a9749dab | 369 | instance, @kbd{M-1 M-! gunzip < foo.gz @key{RET}} would insert the |
d408f8d0 | 370 | uncompressed equivalent of @file{foo.gz} into the current buffer. |
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371 | |
372 | If the shell command line ends in @samp{&}, it runs asynchronously. | |
373 | For a synchronous shell command, @code{shell-command} returns the | |
374 | command's exit status (0 means success), when it is called from a Lisp | |
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375 | program. You do not get any status information for an asynchronous |
376 | command, since it hasn't finished yet. | |
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377 | |
378 | @kindex M-| | |
379 | @findex shell-command-on-region | |
380 | @kbd{M-|} (@code{shell-command-on-region}) is like @kbd{M-!} but | |
381 | passes the contents of the region as the standard input to the shell | |
382 | command, instead of no input. If a numeric argument is used, meaning | |
383 | insert the output in the current buffer, then the old region is deleted | |
384 | first and the output replaces it as the contents of the region. It | |
385 | returns the command's exit status when it is called from a Lisp program. | |
386 | ||
d408f8d0 RS |
387 | One use for @kbd{M-|} is to run @code{uudecode}. For instance, if |
388 | the buffer contains uuencoded text, type @kbd{C-x h M-| uudecode | |
389 | @key{RET}} to feed the entire buffer contents to the @code{uudecode} | |
390 | program. That program will ignore everything except the encoded text, | |
391 | and will store the decoded output into the file whose name is | |
392 | specified in the encoded text. | |
393 | ||
6bf7aab6 | 394 | @vindex shell-file-name |
6bf7aab6 | 395 | Both @kbd{M-!} and @kbd{M-|} use @code{shell-file-name} to specify the |
60a96371 | 396 | shell to use. This variable is initialized based on your @env{SHELL} |
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397 | environment variable when Emacs is started. If the file name does not |
398 | specify a directory, the directories in the list @code{exec-path} are | |
399 | searched; this list is initialized based on the environment variable | |
60a96371 | 400 | @env{PATH} when Emacs is started. Your @file{.emacs} file can override |
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401 | either or both of these default initializations.@refill |
402 | ||
403 | Both @kbd{M-!} and @kbd{M-|} wait for the shell command to complete. | |
404 | To stop waiting, type @kbd{C-g} to quit; that terminates the shell | |
405 | command with the signal @code{SIGINT}---the same signal that @kbd{C-c} | |
406 | normally generates in the shell. Emacs waits until the command actually | |
407 | terminates. If the shell command doesn't stop (because it ignores the | |
408 | @code{SIGINT} signal), type @kbd{C-g} again; this sends the command a | |
409 | @code{SIGKILL} signal which is impossible to ignore. | |
410 | ||
411 | To specify a coding system for @kbd{M-!} or @kbd{M-|}, use the command | |
412 | @kbd{C-x @key{RET} c} immediately beforehand. @xref{Specify Coding}. | |
413 | ||
414 | @vindex shell-command-default-error-buffer | |
415 | Error output from the command is normally intermixed with the regular | |
416 | output. If you set the variable | |
417 | @code{shell-command-default-error-buffer} to a string, which is a buffer | |
418 | name, error output is inserted before point in the buffer of that name. | |
419 | ||
420 | @node Interactive Shell | |
421 | @subsection Interactive Inferior Shell | |
422 | ||
423 | @findex shell | |
424 | To run a subshell interactively, putting its typescript in an Emacs | |
425 | buffer, use @kbd{M-x shell}. This creates (or reuses) a buffer named | |
426 | @samp{*shell*} and runs a subshell with input coming from and output going | |
427 | to that buffer. That is to say, any ``terminal output'' from the subshell | |
428 | goes into the buffer, advancing point, and any ``terminal input'' for | |
429 | the subshell comes from text in the buffer. To give input to the subshell, | |
430 | go to the end of the buffer and type the input, terminated by @key{RET}. | |
431 | ||
432 | Emacs does not wait for the subshell to do anything. You can switch | |
433 | windows or buffers and edit them while the shell is waiting, or while it is | |
434 | running a command. Output from the subshell waits until Emacs has time to | |
435 | process it; this happens whenever Emacs is waiting for keyboard input or | |
436 | for time to elapse. | |
437 | ||
df9d7630 RS |
438 | @cindex @code{comint-highlight-input} face |
439 | @cindex @code{comint-highlight-prompt} face | |
440 | Input lines, once you submit them, are displayed using the face | |
441 | @code{comint-highlight-input}, and prompts are displayed using the | |
442 | face @code{comint-highlight-prompt}. This makes it easier to see | |
443 | previous input lines in the buffer. @xref{Faces}. | |
444 | ||
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445 | To make multiple subshells, you can invoke @kbd{M-x shell} with a |
446 | prefix argument (e.g. @kbd{C-u M-x shell}), which will read a buffer | |
447 | name and create (or reuse) a subshell in that buffer. You can also | |
448 | rename the @samp{*shell*} buffer using @kbd{M-x rename-uniquely}, then | |
110e58a4 EZ |
449 | create a new @samp{*shell*} buffer using plain @kbd{M-x shell}. All the |
450 | subshells in different buffers run independently and in parallel. | |
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451 | |
452 | @vindex explicit-shell-file-name | |
b2c8319e | 453 | @cindex environment variables for subshells |
60a96371 GM |
454 | @cindex @env{ESHELL} environment variable |
455 | @cindex @env{SHELL} environment variable | |
6bf7aab6 DL |
456 | The file name used to load the subshell is the value of the variable |
457 | @code{explicit-shell-file-name}, if that is non-@code{nil}. Otherwise, | |
60a96371 GM |
458 | the environment variable @env{ESHELL} is used, or the environment |
459 | variable @env{SHELL} if there is no @env{ESHELL}. If the file name | |
6bf7aab6 DL |
460 | specified is relative, the directories in the list @code{exec-path} are |
461 | searched; this list is initialized based on the environment variable | |
60a96371 | 462 | @env{PATH} when Emacs is started. Your @file{.emacs} file can override |
6bf7aab6 DL |
463 | either or both of these default initializations. |
464 | ||
df9d7630 RS |
465 | Emacs sends the new shell the contents of the file |
466 | @file{~/.emacs_@var{shellname}} as input, if it exists, where | |
467 | @var{shellname} is the name of the file that the shell was loaded | |
468 | from. For example, if you use bash, the file sent to it is | |
469 | @file{~/.emacs_bash}. | |
470 | ||
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471 | To specify a coding system for the shell, you can use the command |
472 | @kbd{C-x @key{RET} c} immediately before @kbd{M-x shell}. You can also | |
473 | specify a coding system after starting the shell by using @kbd{C-x | |
474 | @key{RET} p} in the shell buffer. @xref{Specify Coding}. | |
475 | ||
b2c8319e EZ |
476 | @cindex @env{EMACS} environment variable |
477 | Unless the environment variable @env{EMACS} is already defined, | |
478 | Emacs defines it in the subshell, with value @code{t}. A shell script | |
479 | can check this variable to determine whether it has been run from an | |
480 | Emacs subshell. | |
6bf7aab6 DL |
481 | |
482 | @node Shell Mode | |
483 | @subsection Shell Mode | |
484 | @cindex Shell mode | |
485 | @cindex mode, Shell | |
486 | ||
487 | Shell buffers use Shell mode, which defines several special keys | |
488 | attached to the @kbd{C-c} prefix. They are chosen to resemble the usual | |
489 | editing and job control characters present in shells that are not under | |
490 | Emacs, except that you must type @kbd{C-c} first. Here is a complete list | |
491 | of the special key bindings of Shell mode: | |
492 | ||
493 | @table @kbd | |
494 | @item @key{RET} | |
495 | @kindex RET @r{(Shell mode)} | |
496 | @findex comint-send-input | |
df9d7630 RS |
497 | At end of buffer send line as input; otherwise, copy current line to |
498 | end of buffer and send it (@code{comint-send-input}). When a line is | |
fc98b4ba RS |
499 | copied, any prompt at the beginning of the line (text output by |
500 | programs preceding your input) is omitted. (See also the variable | |
501 | @code{comint-use-prompt-regexp-instead-of-fields}.) | |
6bf7aab6 DL |
502 | |
503 | @item @key{TAB} | |
504 | @kindex TAB @r{(Shell mode)} | |
505 | @findex comint-dynamic-complete | |
506 | Complete the command name or file name before point in the shell buffer | |
507 | (@code{comint-dynamic-complete}). @key{TAB} also completes history | |
508 | references (@pxref{History References}) and environment variable names. | |
509 | ||
510 | @vindex shell-completion-fignore | |
511 | @vindex comint-completion-fignore | |
512 | The variable @code{shell-completion-fignore} specifies a list of file | |
fc98b4ba RS |
513 | name extensions to ignore in Shell mode completion. The default |
514 | setting is @code{nil}, but some users prefer @code{("~" "#" "%")} to | |
515 | ignore file names ending in @samp{~}, @samp{#} or @samp{%}. Other | |
6bf7aab6 DL |
516 | related Comint modes use the variable @code{comint-completion-fignore} |
517 | instead. | |
518 | ||
519 | @item M-? | |
520 | @kindex M-? @r{(Shell mode)} | |
521 | @findex comint-dynamic-list-filename@dots{} | |
522 | Display temporarily a list of the possible completions of the file name | |
523 | before point in the shell buffer | |
524 | (@code{comint-dynamic-list-filename-completions}). | |
525 | ||
526 | @item C-d | |
527 | @kindex C-d @r{(Shell mode)} | |
528 | @findex comint-delchar-or-maybe-eof | |
6b61353c | 529 | Either delete a character or send @acronym{EOF} |
6bf7aab6 | 530 | (@code{comint-delchar-or-maybe-eof}). Typed at the end of the shell |
6b61353c | 531 | buffer, @kbd{C-d} sends @acronym{EOF} to the subshell. Typed at any other |
6bf7aab6 DL |
532 | position in the buffer, @kbd{C-d} deletes a character as usual. |
533 | ||
534 | @item C-c C-a | |
535 | @kindex C-c C-a @r{(Shell mode)} | |
fc98b4ba | 536 | @findex comint-bol-or-process-mark |
6bf7aab6 | 537 | Move to the beginning of the line, but after the prompt if any |
fc98b4ba RS |
538 | (@code{comint-bol-or-process-mark}). If you repeat this command twice |
539 | in a row, the second time it moves back to the process mark, which is | |
540 | the beginning of the input that you have not yet sent to the subshell. | |
541 | (Normally that is the same place---the end of the prompt on this | |
542 | line---but after @kbd{C-c @key{SPC}} the process mark may be in a | |
543 | previous line.) | |
6bf7aab6 DL |
544 | |
545 | @item C-c @key{SPC} | |
546 | Accumulate multiple lines of input, then send them together. This | |
547 | command inserts a newline before point, but does not send the preceding | |
548 | text as input to the subshell---at least, not yet. Both lines, the one | |
549 | before this newline and the one after, will be sent together (along with | |
550 | the newline that separates them), when you type @key{RET}. | |
551 | ||
552 | @item C-c C-u | |
553 | @kindex C-c C-u @r{(Shell mode)} | |
554 | @findex comint-kill-input | |
555 | Kill all text pending at end of buffer to be sent as input | |
556 | (@code{comint-kill-input}). | |
557 | ||
558 | @item C-c C-w | |
559 | @kindex C-c C-w @r{(Shell mode)} | |
560 | Kill a word before point (@code{backward-kill-word}). | |
561 | ||
562 | @item C-c C-c | |
563 | @kindex C-c C-c @r{(Shell mode)} | |
564 | @findex comint-interrupt-subjob | |
565 | Interrupt the shell or its current subjob if any | |
566 | (@code{comint-interrupt-subjob}). This command also kills | |
567 | any shell input pending in the shell buffer and not yet sent. | |
568 | ||
569 | @item C-c C-z | |
570 | @kindex C-c C-z @r{(Shell mode)} | |
571 | @findex comint-stop-subjob | |
572 | Stop the shell or its current subjob if any (@code{comint-stop-subjob}). | |
573 | This command also kills any shell input pending in the shell buffer and | |
574 | not yet sent. | |
575 | ||
576 | @item C-c C-\ | |
577 | @findex comint-quit-subjob | |
578 | @kindex C-c C-\ @r{(Shell mode)} | |
579 | Send quit signal to the shell or its current subjob if any | |
580 | (@code{comint-quit-subjob}). This command also kills any shell input | |
581 | pending in the shell buffer and not yet sent. | |
582 | ||
583 | @item C-c C-o | |
584 | @kindex C-c C-o @r{(Shell mode)} | |
97f59309 MB |
585 | @findex comint-delete-output |
586 | Delete the last batch of output from a shell command | |
587 | (@code{comint-delete-output}). This is useful if a shell command spews | |
588 | out lots of output that just gets in the way. This command used to be | |
589 | called @code{comint-kill-output}. | |
590 | ||
591 | @item C-c C-s | |
592 | @kindex C-c C-s @r{(Shell mode)} | |
593 | @findex comint-write-output | |
594 | Write the last batch of output from a shell command to a file | |
595 | (@code{comint-write-output}). With a prefix argument, the file is | |
596 | appended to instead. Any prompt at the end of the output is not | |
597 | written. | |
6bf7aab6 DL |
598 | |
599 | @item C-c C-r | |
600 | @itemx C-M-l | |
601 | @kindex C-c C-r @r{(Shell mode)} | |
602 | @kindex C-M-l @r{(Shell mode)} | |
603 | @findex comint-show-output | |
604 | Scroll to display the beginning of the last batch of output at the top | |
605 | of the window; also move the cursor there (@code{comint-show-output}). | |
606 | ||
607 | @item C-c C-e | |
608 | @kindex C-c C-e @r{(Shell mode)} | |
609 | @findex comint-show-maximum-output | |
610 | Scroll to put the end of the buffer at the bottom of the window | |
611 | (@code{comint-show-maximum-output}). | |
612 | ||
613 | @item C-c C-f | |
614 | @kindex C-c C-f @r{(Shell mode)} | |
615 | @findex shell-forward-command | |
616 | @vindex shell-command-regexp | |
617 | Move forward across one shell command, but not beyond the current line | |
618 | (@code{shell-forward-command}). The variable @code{shell-command-regexp} | |
619 | specifies how to recognize the end of a command. | |
620 | ||
621 | @item C-c C-b | |
622 | @kindex C-c C-b @r{(Shell mode)} | |
623 | @findex shell-backward-command | |
624 | Move backward across one shell command, but not beyond the current line | |
625 | (@code{shell-backward-command}). | |
626 | ||
627 | @item C-c C-l | |
628 | @kindex C-c C-l @r{(Shell mode)} | |
629 | @findex comint-dynamic-list-input-ring | |
630 | Display the buffer's history of shell commands in another window | |
631 | (@code{comint-dynamic-list-input-ring}). | |
632 | ||
633 | @item M-x dirs | |
634 | Ask the shell what its current directory is, so that Emacs can agree | |
635 | with the shell. | |
636 | ||
637 | @item M-x send-invisible @key{RET} @var{text} @key{RET} | |
638 | @findex send-invisible | |
639 | Send @var{text} as input to the shell, after reading it without | |
640 | echoing. This is useful when a shell command runs a program that asks | |
641 | for a password. | |
642 | ||
643 | Alternatively, you can arrange for Emacs to notice password prompts | |
644 | and turn off echoing for them, as follows: | |
645 | ||
646 | @example | |
647 | (add-hook 'comint-output-filter-functions | |
648 | 'comint-watch-for-password-prompt) | |
649 | @end example | |
650 | ||
651 | @item M-x comint-continue-subjob | |
652 | @findex comint-continue-subjob | |
653 | Continue the shell process. This is useful if you accidentally suspend | |
654 | the shell process.@footnote{You should not suspend the shell process. | |
655 | Suspending a subjob of the shell is a completely different matter---that | |
656 | is normal practice, but you must use the shell to continue the subjob; | |
657 | this command won't do it.} | |
658 | ||
659 | @item M-x comint-strip-ctrl-m | |
660 | @findex comint-strip-ctrl-m | |
661 | Discard all control-M characters from the current group of shell output. | |
662 | The most convenient way to use this command is to make it run | |
663 | automatically when you get output from the subshell. To do that, | |
664 | evaluate this Lisp expression: | |
665 | ||
666 | @example | |
667 | (add-hook 'comint-output-filter-functions | |
668 | 'comint-strip-ctrl-m) | |
669 | @end example | |
670 | ||
671 | @item M-x comint-truncate-buffer | |
672 | @findex comint-truncate-buffer | |
673 | This command truncates the shell buffer to a certain maximum number of | |
674 | lines, specified by the variable @code{comint-buffer-maximum-size}. | |
675 | Here's how to do this automatically each time you get output from the | |
676 | subshell: | |
677 | ||
678 | @example | |
679 | (add-hook 'comint-output-filter-functions | |
680 | 'comint-truncate-buffer) | |
681 | @end example | |
682 | @end table | |
683 | ||
684 | Shell mode also customizes the paragraph commands so that only shell | |
685 | prompts start new paragraphs. Thus, a paragraph consists of an input | |
686 | command plus the output that follows it in the buffer. | |
687 | ||
688 | @cindex Comint mode | |
689 | @cindex mode, Comint | |
690 | Shell mode is a derivative of Comint mode, a general-purpose mode for | |
691 | communicating with interactive subprocesses. Most of the features of | |
692 | Shell mode actually come from Comint mode, as you can see from the | |
bd9e9287 MB |
693 | command names listed above. The special features of Shell mode include |
694 | the directory tracking feature, and a few user commands. | |
6bf7aab6 DL |
695 | |
696 | Other Emacs features that use variants of Comint mode include GUD | |
697 | (@pxref{Debuggers}) and @kbd{M-x run-lisp} (@pxref{External Lisp}). | |
698 | ||
699 | @findex comint-run | |
700 | You can use @kbd{M-x comint-run} to execute any program of your choice | |
701 | in a subprocess using unmodified Comint mode---without the | |
702 | specializations of Shell mode. | |
703 | ||
704 | @node Shell History | |
705 | @subsection Shell Command History | |
706 | ||
707 | Shell buffers support three ways of repeating earlier commands. You | |
708 | can use the same keys used in the minibuffer; these work much as they do | |
709 | in the minibuffer, inserting text from prior commands while point | |
710 | remains always at the end of the buffer. You can move through the | |
711 | buffer to previous inputs in their original place, then resubmit them or | |
712 | copy them to the end. Or you can use a @samp{!}-style history | |
713 | reference. | |
714 | ||
715 | @menu | |
716 | * Ring: Shell Ring. Fetching commands from the history list. | |
717 | * Copy: Shell History Copying. Moving to a command and then copying it. | |
718 | * History References:: Expanding @samp{!}-style history references. | |
719 | @end menu | |
720 | ||
721 | @node Shell Ring | |
722 | @subsubsection Shell History Ring | |
723 | ||
724 | @table @kbd | |
725 | @findex comint-previous-input | |
726 | @kindex M-p @r{(Shell mode)} | |
727 | @item M-p | |
728 | Fetch the next earlier old shell command. | |
729 | ||
730 | @kindex M-n @r{(Shell mode)} | |
731 | @findex comint-next-input | |
732 | @item M-n | |
733 | Fetch the next later old shell command. | |
734 | ||
735 | @kindex M-r @r{(Shell mode)} | |
736 | @kindex M-s @r{(Shell mode)} | |
737 | @findex comint-previous-matching-input | |
738 | @findex comint-next-matching-input | |
739 | @item M-r @var{regexp} @key{RET} | |
740 | @itemx M-s @var{regexp} @key{RET} | |
741 | Search backwards or forwards for old shell commands that match @var{regexp}. | |
742 | ||
743 | @item C-c C-x @r{(Shell mode)} | |
744 | @findex comint-get-next-from-history | |
745 | Fetch the next subsequent command from the history. | |
91179e97 RS |
746 | |
747 | @item C-c . @r{(Shell mode)} | |
748 | @findex comint-input-previous-argument | |
749 | Fetch one argument from an old shell command. | |
6bf7aab6 DL |
750 | @end table |
751 | ||
752 | Shell buffers provide a history of previously entered shell commands. To | |
753 | reuse shell commands from the history, use the editing commands @kbd{M-p}, | |
754 | @kbd{M-n}, @kbd{M-r} and @kbd{M-s}. These work just like the minibuffer | |
755 | history commands except that they operate on the text at the end of the | |
756 | shell buffer, where you would normally insert text to send to the shell. | |
757 | ||
758 | @kbd{M-p} fetches an earlier shell command to the end of the shell buffer. | |
759 | Successive use of @kbd{M-p} fetches successively earlier shell commands, | |
760 | each replacing any text that was already present as potential shell input. | |
761 | @kbd{M-n} does likewise except that it finds successively more recent shell | |
762 | commands from the buffer. | |
763 | ||
764 | The history search commands @kbd{M-r} and @kbd{M-s} read a regular | |
765 | expression and search through the history for a matching command. Aside | |
766 | from the choice of which command to fetch, they work just like @kbd{M-p} | |
ffe4b4e3 | 767 | and @kbd{M-n}. If you enter an empty regexp, these commands reuse the |
6bf7aab6 DL |
768 | same regexp used last time. |
769 | ||
770 | When you find the previous input you want, you can resubmit it by | |
771 | typing @key{RET}, or you can edit it first and then resubmit it if you | |
772 | wish. | |
773 | ||
774 | Often it is useful to reexecute several successive shell commands that | |
775 | were previously executed in sequence. To do this, first find and | |
776 | reexecute the first command of the sequence. Then type @kbd{C-c C-x}; | |
777 | that will fetch the following command---the one that follows the command | |
778 | you just repeated. Then type @key{RET} to reexecute this command. You | |
779 | can reexecute several successive commands by typing @kbd{C-c C-x | |
780 | @key{RET}} over and over. | |
781 | ||
91179e97 RS |
782 | The command @kbd{C-c .}@: (@code{comint-input-previous-argument}) |
783 | copies an individual argument from a previous command, like @kbd{ESC | |
784 | .} in Bash. The simplest use copies the last argument from the | |
785 | previous shell command. With a prefix argument @var{n}, it copies the | |
786 | @var{n}th argument instead. Repeating @kbd{C-c .} copies from an | |
787 | earlier shell command instead, always using the same value of @var{n} | |
788 | (don't give a prefix argument when you repeat the @kbd{C-c .} | |
789 | command). | |
790 | ||
6bf7aab6 DL |
791 | These commands get the text of previous shell commands from a special |
792 | history list, not from the shell buffer itself. Thus, editing the shell | |
793 | buffer, or even killing large parts of it, does not affect the history | |
794 | that these commands access. | |
795 | ||
796 | @vindex shell-input-ring-file-name | |
797 | Some shells store their command histories in files so that you can | |
798 | refer to previous commands from previous shell sessions. Emacs reads | |
799 | the command history file for your chosen shell, to initialize its own | |
800 | command history. The file name is @file{~/.bash_history} for bash, | |
801 | @file{~/.sh_history} for ksh, and @file{~/.history} for other shells. | |
802 | ||
803 | @node Shell History Copying | |
804 | @subsubsection Shell History Copying | |
805 | ||
806 | @table @kbd | |
807 | @kindex C-c C-p @r{(Shell mode)} | |
808 | @findex comint-previous-prompt | |
809 | @item C-c C-p | |
810 | Move point to the previous prompt (@code{comint-previous-prompt}). | |
811 | ||
812 | @kindex C-c C-n @r{(Shell mode)} | |
813 | @findex comint-next-prompt | |
814 | @item C-c C-n | |
815 | Move point to the following prompt (@code{comint-next-prompt}). | |
816 | ||
817 | @kindex C-c RET @r{(Shell mode)} | |
818 | @findex comint-copy-old-input | |
819 | @item C-c @key{RET} | |
820 | Copy the input command which point is in, inserting the copy at the end | |
821 | of the buffer (@code{comint-copy-old-input}). This is useful if you | |
822 | move point back to a previous command. After you copy the command, you | |
823 | can submit the copy as input with @key{RET}. If you wish, you can | |
824 | edit the copy before resubmitting it. | |
825 | @end table | |
826 | ||
827 | Moving to a previous input and then copying it with @kbd{C-c | |
828 | @key{RET}} produces the same results---the same buffer contents---that | |
829 | you would get by using @kbd{M-p} enough times to fetch that previous | |
830 | input from the history list. However, @kbd{C-c @key{RET}} copies the | |
831 | text from the buffer, which can be different from what is in the history | |
832 | list if you edit the input text in the buffer after it has been sent. | |
833 | ||
834 | @node History References | |
835 | @subsubsection Shell History References | |
836 | @cindex history reference | |
837 | ||
df9d7630 RS |
838 | Various shells including csh and bash support @dfn{history |
839 | references} that begin with @samp{!} and @samp{^}. Shell mode | |
840 | recognizes these constructs, and can perform the history substitution | |
841 | for you. | |
842 | ||
843 | If you insert a history reference and type @key{TAB}, this searches | |
844 | the input history for a matching command, performs substitution if | |
845 | necessary, and places the result in the buffer in place of the history | |
846 | reference. For example, you can fetch the most recent command | |
847 | beginning with @samp{mv} with @kbd{! m v @key{TAB}}. You can edit the | |
848 | command if you wish, and then resubmit the command to the shell by | |
849 | typing @key{RET}. | |
850 | ||
851 | @vindex comint-input-autoexpand | |
852 | @findex comint-magic-space | |
853 | Shell mode can optionally expand history references in the buffer | |
854 | when you send them to the shell. To request this, set the variable | |
855 | @code{comint-input-autoexpand} to @code{input}. You can make | |
856 | @key{SPC} perform history expansion by binding @key{SPC} to the | |
857 | command @code{comint-magic-space}. | |
6bf7aab6 DL |
858 | |
859 | @vindex shell-prompt-pattern | |
860 | @vindex comint-prompt-regexp | |
bd9e9287 MB |
861 | @vindex comint-use-prompt-regexp-instead-of-fields |
862 | @cindex prompt, shell | |
df9d7630 RS |
863 | Shell mode recognizes history references when they follow a prompt. |
864 | Normally, any text output by a program at the beginning of an input | |
865 | line is considered a prompt. However, if the variable | |
866 | @code{comint-use-prompt-regexp-instead-of-fields} is non-@code{nil}, | |
867 | then Comint mode uses a regular expression to recognize prompts. In | |
868 | general, the variable @code{comint-prompt-regexp} specifies the | |
869 | regular expression; Shell mode uses the variable | |
870 | @code{shell-prompt-pattern} to set up @code{comint-prompt-regexp} in | |
871 | the shell buffer. | |
872 | ||
873 | @node Directory Tracking | |
874 | @subsection Directory Tracking | |
875 | @cindex directory tracking | |
6bf7aab6 | 876 | |
df9d7630 RS |
877 | @vindex shell-pushd-regexp |
878 | @vindex shell-popd-regexp | |
879 | @vindex shell-cd-regexp | |
880 | Shell mode keeps track of @samp{cd}, @samp{pushd} and @samp{popd} | |
881 | commands given to the inferior shell, so it can keep the | |
882 | @samp{*shell*} buffer's default directory the same as the shell's | |
883 | working directory. It recognizes these commands syntactically, by | |
884 | examining lines of input that are sent. | |
6bf7aab6 | 885 | |
df9d7630 RS |
886 | If you use aliases for these commands, you can tell Emacs to |
887 | recognize them also. For example, if the value of the variable | |
888 | @code{shell-pushd-regexp} matches the beginning of a shell command | |
889 | line, that line is regarded as a @code{pushd} command. Change this | |
890 | variable when you add aliases for @samp{pushd}. Likewise, | |
891 | @code{shell-popd-regexp} and @code{shell-cd-regexp} are used to | |
892 | recognize commands with the meaning of @samp{popd} and @samp{cd}. | |
893 | These commands are recognized only at the beginning of a shell command | |
894 | line. | |
895 | ||
fc98b4ba | 896 | @ignore @c This seems to have been deleted long ago. |
df9d7630 RS |
897 | @vindex shell-set-directory-error-hook |
898 | If Emacs gets an error while trying to handle what it believes is a | |
899 | @samp{cd}, @samp{pushd} or @samp{popd} command, it runs the hook | |
900 | @code{shell-set-directory-error-hook} (@pxref{Hooks}). | |
fc98b4ba | 901 | @end ignore |
df9d7630 RS |
902 | |
903 | @findex dirs | |
904 | If Emacs gets confused about changes in the current directory of the | |
905 | subshell, use the command @kbd{M-x dirs} to ask the shell what its | |
906 | current directory is. This command works for shells that support the | |
907 | most common command syntax; it may not work for unusual shells. | |
908 | ||
909 | @findex dirtrack-mode | |
910 | You can also use @kbd{M-x dirtrack-mode} to enable (or disable) an | |
911 | alternative and more aggressive method of tracking changes in the | |
912 | current directory. | |
6bf7aab6 DL |
913 | |
914 | @node Shell Options | |
915 | @subsection Shell Mode Options | |
916 | ||
917 | @vindex comint-scroll-to-bottom-on-input | |
918 | If the variable @code{comint-scroll-to-bottom-on-input} is | |
919 | non-@code{nil}, insertion and yank commands scroll the selected window | |
920 | to the bottom before inserting. | |
921 | ||
922 | @vindex comint-scroll-show-maximum-output | |
923 | If @code{comint-scroll-show-maximum-output} is non-@code{nil}, then | |
fcc91da6 | 924 | arrival of output when point is at the end tries to place the last line of |
021037cb EZ |
925 | text at the bottom line of the window, so as to show as much useful |
926 | text as possible. (This mimics the scrolling behavior of many | |
927 | terminals.) The default is @code{nil}. | |
6bf7aab6 | 928 | |
fcc91da6 RS |
929 | @vindex comint-move-point-for-output |
930 | By setting @code{comint-move-point-for-output}, you can opt for | |
6bf7aab6 DL |
931 | having point jump to the end of the buffer whenever output arrives---no |
932 | matter where in the buffer point was before. If the value is | |
933 | @code{this}, point jumps in the selected window. If the value is | |
021037cb | 934 | @code{all}, point jumps in each window that shows the Comint buffer. If |
6bf7aab6 DL |
935 | the value is @code{other}, point jumps in all nonselected windows that |
936 | show the current buffer. The default value is @code{nil}, which means | |
937 | point does not jump to the end. | |
938 | ||
939 | @vindex comint-input-ignoredups | |
940 | The variable @code{comint-input-ignoredups} controls whether successive | |
941 | identical inputs are stored in the input history. A non-@code{nil} | |
942 | value means to omit an input that is the same as the previous input. | |
943 | The default is @code{nil}, which means to store each input even if it is | |
944 | equal to the previous input. | |
945 | ||
946 | @vindex comint-completion-addsuffix | |
947 | @vindex comint-completion-recexact | |
948 | @vindex comint-completion-autolist | |
949 | Three variables customize file name completion. The variable | |
950 | @code{comint-completion-addsuffix} controls whether completion inserts a | |
951 | space or a slash to indicate a fully completed file or directory name | |
952 | (non-@code{nil} means do insert a space or slash). | |
953 | @code{comint-completion-recexact}, if non-@code{nil}, directs @key{TAB} | |
954 | to choose the shortest possible completion if the usual Emacs completion | |
955 | algorithm cannot add even a single character. | |
956 | @code{comint-completion-autolist}, if non-@code{nil}, says to list all | |
957 | the possible completions whenever completion is not exact. | |
958 | ||
fc98b4ba | 959 | @vindex shell-completion-execonly |
6bf7aab6 | 960 | Command completion normally considers only executable files. |
fc98b4ba | 961 | If you set @code{shell-completion-execonly} to @code{nil}, |
6bf7aab6 DL |
962 | it considers nonexecutable files as well. |
963 | ||
964 | @findex shell-pushd-tohome | |
965 | @findex shell-pushd-dextract | |
966 | @findex shell-pushd-dunique | |
967 | You can configure the behavior of @samp{pushd}. Variables control | |
968 | whether @samp{pushd} behaves like @samp{cd} if no argument is given | |
969 | (@code{shell-pushd-tohome}), pop rather than rotate with a numeric | |
970 | argument (@code{shell-pushd-dextract}), and only add directories to the | |
971 | directory stack if they are not already on it | |
972 | (@code{shell-pushd-dunique}). The values you choose should match the | |
973 | underlying shell, of course. | |
974 | ||
17217162 RS |
975 | If you want Shell mode to handle color output from shell commands, |
976 | you can enable ANSI Color mode. Here is how to do this: | |
977 | ||
978 | @example | |
979 | (add-hook 'shell-mode-hook 'ansi-color-for-comint-mode-on) | |
980 | @end example | |
981 | ||
3b65ce47 | 982 | @node Terminal emulator |
df9d7630 | 983 | @subsection Emacs Terminal Emulator |
3b65ce47 DL |
984 | @findex term |
985 | ||
df9d7630 RS |
986 | To run a subshell in a terminal emulator, putting its typescript in |
987 | an Emacs buffer, use @kbd{M-x term}. This creates (or reuses) a | |
fc98b4ba RS |
988 | buffer named @samp{*terminal*}, and runs a subshell with input coming |
989 | from your keyboard, and output going to that buffer. | |
df9d7630 RS |
990 | |
991 | The terminal emulator uses Term mode, which has two input modes. In | |
992 | line mode, Term basically acts like Shell mode; see @ref{Shell Mode}. | |
3b65ce47 | 993 | |
df9d7630 RS |
994 | In char mode, each character is sent directly to the inferior |
995 | subshell, as ``terminal input.'' Any ``echoing'' of your input is the | |
996 | responsibility of the subshell. The sole exception is the terminal | |
997 | escape character, which by default is @kbd{C-c} (@pxref{Term Mode}). | |
3b65ce47 DL |
998 | Any ``terminal output'' from the subshell goes into the buffer, |
999 | advancing point. | |
1000 | ||
df9d7630 RS |
1001 | Some programs (such as Emacs itself) need to control the appearance |
1002 | on the terminal screen in detail. They do this by sending special | |
1003 | control codes. The exact control codes needed vary from terminal to | |
1004 | terminal, but nowadays most terminals and terminal emulators | |
1005 | (including @code{xterm}) understand the ANSI-standard (VT100-style) | |
1006 | escape sequences. Term mode recognizes these escape sequences, and | |
1007 | handles each one appropriately, changing the buffer so that the | |
1008 | appearance of the window matches what it would be on a real terminal. | |
1009 | You can actually run Emacs inside an Emacs Term window. | |
1010 | ||
1011 | The file name used to load the subshell is determined the same way | |
1012 | as for Shell mode. To make multiple terminal emulators, rename the | |
fc98b4ba | 1013 | buffer @samp{*terminal*} to something different using @kbd{M-x |
df9d7630 RS |
1014 | rename-uniquely}, just as with Shell mode. |
1015 | ||
1016 | Unlike Shell mode, Term mode does not track the current directory by | |
1017 | examining your input. But some shells can tell Term what the current | |
1018 | directory is. This is done automatically by @code{bash} version 1.15 | |
1019 | and later. | |
3b65ce47 DL |
1020 | |
1021 | @node Term Mode | |
1022 | @subsection Term Mode | |
1023 | @cindex Term mode | |
1024 | @cindex mode, Term | |
1025 | ||
df9d7630 RS |
1026 | The terminal emulator uses Term mode, which has two input modes. In |
1027 | line mode, Term basically acts like Shell mode; see @ref{Shell Mode}. | |
1028 | In char mode, each character is sent directly to the inferior | |
1029 | subshell, except for the Term escape character, normally @kbd{C-c}. | |
1030 | ||
1031 | To switch between line and char mode, use these commands: | |
3b65ce47 | 1032 | |
3b65ce47 | 1033 | @table @kbd |
91179e97 | 1034 | @kindex C-c C-j @r{(Term mode)} |
3b65ce47 | 1035 | @findex term-char-mode |
91179e97 | 1036 | @item C-c C-j |
3b65ce47 DL |
1037 | Switch to line mode. Do nothing if already in line mode. |
1038 | ||
91179e97 | 1039 | @kindex C-c C-k @r{(Term mode)} |
3b65ce47 | 1040 | @findex term-line-mode |
91179e97 | 1041 | @item C-c C-k |
3b65ce47 DL |
1042 | Switch to char mode. Do nothing if already in char mode. |
1043 | @end table | |
1044 | ||
df9d7630 RS |
1045 | The following commands are only available in char mode: |
1046 | ||
3b65ce47 DL |
1047 | @table @kbd |
1048 | @item C-c C-c | |
1049 | Send a literal @key{C-c} to the sub-shell. | |
1050 | ||
1051 | @item C-c C-x | |
1052 | A prefix command to access the global @key{C-x} commands conveniently. | |
1053 | For example, @kbd{C-c C-x o} invokes the global binding of | |
1054 | @kbd{C-x o}, which is normally @samp{other-window}. | |
1055 | @end table | |
1056 | ||
1057 | @node Paging in Term | |
df9d7630 RS |
1058 | @subsection Page-At-A-Time Output |
1059 | @cindex page-at-a-time | |
3b65ce47 | 1060 | |
df9d7630 RS |
1061 | Term mode has a page-at-a-time feature. When enabled it makes |
1062 | output pause at the end of each screenful. | |
3b65ce47 DL |
1063 | |
1064 | @table @kbd | |
1065 | @kindex C-c C-q @r{(Term mode)} | |
1066 | @findex term-pager-toggle | |
1067 | @item C-c C-q | |
df9d7630 RS |
1068 | Toggle the page-at-a-time feature. This command works in both line |
1069 | and char modes. When page-at-a-time is enabled, the mode-line | |
1070 | displays the word @samp{page}. | |
3b65ce47 DL |
1071 | @end table |
1072 | ||
df9d7630 RS |
1073 | With page-at-a-time enabled, whenever Term receives more than a |
1074 | screenful of output since your last input, it pauses, displaying | |
1075 | @samp{**MORE**} in the mode-line. Type @key{SPC} to display the next | |
1076 | screenful of output. Type @kbd{?} to see your other options. The | |
892c6176 | 1077 | interface is similar to the @code{more} program. |
3b65ce47 | 1078 | |
6bf7aab6 DL |
1079 | @node Remote Host |
1080 | @subsection Remote Host Shell | |
1081 | @cindex remote host | |
1082 | @cindex connecting to remote host | |
1083 | @cindex Telnet | |
1084 | @cindex Rlogin | |
1085 | ||
3b65ce47 DL |
1086 | You can login to a remote computer, using whatever commands you |
1087 | would from a regular terminal (e.g.@: using the @code{telnet} or | |
1088 | @code{rlogin} commands), from a Term window. | |
1089 | ||
df9d7630 RS |
1090 | A program that asks you for a password will normally suppress |
1091 | echoing of the password, so the password will not show up in the | |
1092 | buffer. This will happen just as if you were using a real terminal, | |
1093 | if the buffer is in char mode. If it is in line mode, the password is | |
1094 | temporarily visible, but will be erased when you hit return. (This | |
1095 | happens automatically; there is no special password processing.) | |
3b65ce47 | 1096 | |
df9d7630 | 1097 | When you log in to a different machine, you need to specify the type |
021037cb | 1098 | of terminal you're using. Terminal types @samp{ansi} or @samp{vt100} |
df9d7630 | 1099 | will work on most systems. |
3b65ce47 DL |
1100 | |
1101 | @c If you are talking to a Bourne-compatible | |
60a96371 | 1102 | @c shell, and your system understands the @env{TERMCAP} variable, |
3b65ce47 DL |
1103 | @c you can use the command @kbd{M-x shell-send-termcap}, which |
1104 | @c sends a string specifying the terminal type and size. | |
1105 | @c (This command is also useful after the window has changed size.) | |
1106 | ||
1107 | @c You can of course run @samp{gdb} on that remote computer. One useful | |
1108 | @c trick: If you invoke gdb with the @code{--fullname} option, | |
1109 | @c it will send special commands to Emacs that will cause Emacs to | |
1110 | @c pop up the source files you're debugging. This will work | |
1111 | @c whether or not gdb is running on a different computer than Emacs, | |
1112 | @c as long as Emacs can access the source files specified by gdb. | |
1113 | ||
df9d7630 | 1114 | @ignore |
021037cb | 1115 | You cannot log in to a remote computer using the Shell mode. |
3b65ce47 DL |
1116 | @c (This will change when Shell is re-written to use Term.) |
1117 | Instead, Emacs provides two commands for logging in to another computer | |
df9d7630 | 1118 | and communicating with it through an Emacs buffer using Comint mode: |
6bf7aab6 DL |
1119 | |
1120 | @table @kbd | |
1121 | @item M-x telnet @key{RET} @var{hostname} @key{RET} | |
1122 | Set up a Telnet connection to the computer named @var{hostname}. | |
1123 | @item M-x rlogin @key{RET} @var{hostname} @key{RET} | |
1124 | Set up an Rlogin connection to the computer named @var{hostname}. | |
1125 | @end table | |
1126 | ||
1127 | @findex telnet | |
1128 | Use @kbd{M-x telnet} to set up a Telnet connection to another | |
1129 | computer. (Telnet is the standard Internet protocol for remote login.) | |
1130 | It reads the host name of the other computer as an argument with the | |
1131 | minibuffer. Once the connection is established, talking to the other | |
1132 | computer works like talking to a subshell: you can edit input with the | |
1133 | usual Emacs commands, and send it a line at a time by typing @key{RET}. | |
1134 | The output is inserted in the Telnet buffer interspersed with the input. | |
1135 | ||
1136 | @findex rlogin | |
1137 | @vindex rlogin-explicit-args | |
1138 | Use @kbd{M-x rlogin} to set up an Rlogin connection. Rlogin is | |
1139 | another remote login communication protocol, essentially much like the | |
1140 | Telnet protocol but incompatible with it, and supported only by certain | |
1141 | systems. Rlogin's advantages are that you can arrange not to have to | |
1142 | give your user name and password when communicating between two machines | |
1143 | you frequently use, and that you can make an 8-bit-clean connection. | |
1144 | (To do that in Emacs, set @code{rlogin-explicit-args} to @code{("-8")} | |
1145 | before you run Rlogin.) | |
1146 | ||
1147 | @kbd{M-x rlogin} sets up the default file directory of the Emacs | |
1148 | buffer to access the remote host via FTP (@pxref{File Names}), and it | |
1149 | tracks the shell commands that change the current directory, just like | |
1150 | Shell mode. | |
1151 | ||
1152 | @findex rlogin-directory-tracking-mode | |
1153 | There are two ways of doing directory tracking in an Rlogin | |
1154 | buffer---either with remote directory names | |
1155 | @file{/@var{host}:@var{dir}/} or with local names (that works if the | |
1156 | ``remote'' machine shares file systems with your machine of origin). | |
1157 | You can use the command @code{rlogin-directory-tracking-mode} to switch | |
1158 | modes. No argument means use remote directory names, a positive | |
1159 | argument means use local names, and a negative argument means turn | |
1160 | off directory tracking. | |
1161 | ||
df9d7630 RS |
1162 | @end ignore |
1163 | ||
6bf7aab6 DL |
1164 | @node Emacs Server, Hardcopy, Shell, Top |
1165 | @section Using Emacs as a Server | |
1166 | @pindex emacsclient | |
1167 | @cindex Emacs as a server | |
1168 | @cindex server, using Emacs as | |
60a96371 | 1169 | @cindex @env{EDITOR} environment variable |
6bf7aab6 DL |
1170 | |
1171 | Various programs such as @code{mail} can invoke your choice of editor | |
1172 | to edit a particular piece of text, such as a message that you are | |
1173 | sending. By convention, most of these programs use the environment | |
60a96371 GM |
1174 | variable @env{EDITOR} to specify which editor to run. If you set |
1175 | @env{EDITOR} to @samp{emacs}, they invoke Emacs---but in an | |
6bf7aab6 DL |
1176 | inconvenient fashion, by starting a new, separate Emacs process. This |
1177 | is inconvenient because it takes time and because the new Emacs process | |
021037cb | 1178 | doesn't share the buffers in any existing Emacs process. |
6bf7aab6 DL |
1179 | |
1180 | You can arrange to use your existing Emacs process as the editor for | |
1181 | programs like @code{mail} by using the Emacs client and Emacs server | |
1182 | programs. Here is how. | |
1183 | ||
60a96371 | 1184 | @cindex @env{TEXEDIT} environment variable |
6bf7aab6 DL |
1185 | First, the preparation. Within Emacs, call the function |
1186 | @code{server-start}. (Your @file{.emacs} file can do this automatically | |
1187 | if you add the expression @code{(server-start)} to it.) Then, outside | |
60a96371 | 1188 | Emacs, set the @env{EDITOR} environment variable to @samp{emacsclient}. |
6bf7aab6 DL |
1189 | (Note that some programs use a different environment variable; for |
1190 | example, to make @TeX{} use @samp{emacsclient}, you should set the | |
60a96371 | 1191 | @env{TEXEDIT} environment variable to @samp{emacsclient +%d %s}.) |
6bf7aab6 DL |
1192 | |
1193 | @kindex C-x # | |
1194 | @findex server-edit | |
60a96371 | 1195 | Then, whenever any program invokes your specified @env{EDITOR} |
6bf7aab6 DL |
1196 | program, the effect is to send a message to your principal Emacs telling |
1197 | it to visit a file. (That's what the program @code{emacsclient} does.) | |
1198 | Emacs displays the buffer immediately and you can immediately begin | |
1199 | editing it. | |
1200 | ||
1201 | When you've finished editing that buffer, type @kbd{C-x #} | |
1202 | (@code{server-edit}). This saves the file and sends a message back to | |
1203 | the @code{emacsclient} program telling it to exit. The programs that | |
60a96371 | 1204 | use @env{EDITOR} wait for the ``editor'' (actually, @code{emacsclient}) |
6bf7aab6 DL |
1205 | to exit. @kbd{C-x #} also checks for other pending external requests |
1206 | to edit various files, and selects the next such file. | |
1207 | ||
fc98b4ba RS |
1208 | You can switch to a server buffer manually if you wish; you don't |
1209 | have to arrive at it with @kbd{C-x #}. But @kbd{C-x #} is the way to | |
021037cb | 1210 | say that you are finished with one. |
6bf7aab6 | 1211 | |
df9d7630 RS |
1212 | @vindex server-kill-new-buffers |
1213 | @vindex server-temp-file-regexp | |
1214 | Finishing with a server buffer also kills the buffer, unless it | |
1215 | already existed in the Emacs session before the server asked to create | |
1216 | it. However, if you set @code{server-kill-new-buffers} to @code{nil}, | |
1217 | then a different criterion is used: finishing with a server buffer | |
1218 | kills it if the file name matches the regular expression | |
1219 | @code{server-temp-file-regexp}. This is set up to distinguish certain | |
1220 | ``temporary'' files. | |
1221 | ||
6bf7aab6 DL |
1222 | @vindex server-window |
1223 | If you set the variable @code{server-window} to a window or a frame, | |
1224 | @kbd{C-x #} displays the server buffer in that window or in that frame. | |
1225 | ||
1226 | While @code{mail} or another application is waiting for | |
1227 | @code{emacsclient} to finish, @code{emacsclient} does not read terminal | |
1228 | input. So the terminal that @code{mail} was using is effectively | |
1229 | blocked for the duration. In order to edit with your principal Emacs, | |
1230 | you need to be able to use it without using that terminal. There are | |
df9d7630 | 1231 | three ways to do this: |
6bf7aab6 DL |
1232 | |
1233 | @itemize @bullet | |
1234 | @item | |
1235 | Using a window system, run @code{mail} and the principal Emacs in two | |
1236 | separate windows. While @code{mail} is waiting for @code{emacsclient}, | |
1237 | the window where it was running is blocked, but you can use Emacs by | |
1238 | switching windows. | |
1239 | ||
1240 | @item | |
df9d7630 RS |
1241 | Using virtual terminals, run @code{mail} in one virtual terminal |
1242 | and run Emacs in another. | |
6bf7aab6 | 1243 | |
df9d7630 RS |
1244 | @item |
1245 | Use Shell mode or Term mode in Emacs to run the other program such as | |
1246 | @code{mail}; then, @code{emacsclient} blocks only the subshell under | |
1247 | Emacs, and you can still use Emacs to edit the file. | |
1248 | @end itemize | |
7448f7a2 | 1249 | |
6bf7aab6 | 1250 | If you run @code{emacsclient} with the option @samp{--no-wait}, it |
df9d7630 RS |
1251 | returns immediately without waiting for you to ``finish'' the buffer |
1252 | in Emacs. Note that server buffers created in this way are not killed | |
1253 | automatically when you finish with them. | |
b1a92ebf | 1254 | |
6bf7aab6 DL |
1255 | @menu |
1256 | * Invoking emacsclient:: | |
1257 | @end menu | |
1258 | ||
1259 | @node Invoking emacsclient,, Emacs Server, Emacs Server | |
1260 | @section Invoking @code{emacsclient} | |
1261 | ||
1262 | To run the @code{emacsclient} program, specify file names as arguments, | |
1263 | and optionally line numbers as well. Do it like this: | |
1264 | ||
1265 | @example | |
6039d8e0 | 1266 | emacsclient @r{@{}@r{[}+@var{line}@r{[}@var{column}@r{]}@r{]} @var{filename}@r{@}}@dots{} |
6bf7aab6 DL |
1267 | @end example |
1268 | ||
df9d7630 | 1269 | @noindent |
6bf7aab6 DL |
1270 | This tells Emacs to visit each of the specified files; if you specify a |
1271 | line number for a certain file, Emacs moves to that line in the file. | |
a9749dab RS |
1272 | If you specify a column number as well, Emacs puts point on that column |
1273 | in the line. | |
6bf7aab6 | 1274 | |
df9d7630 RS |
1275 | Ordinarily, @code{emacsclient} does not return until you use the |
1276 | @kbd{C-x #} command on each of these buffers. When that happens, | |
1277 | Emacs sends a message to the @code{emacsclient} program telling it to | |
1278 | return. | |
1279 | ||
1280 | But if you use the option @samp{-n} or @samp{--no-wait} when running | |
1281 | @code{emacsclient}, then it returns immediately. (You can take as | |
1282 | long as you like to edit the files in Emacs.) | |
1283 | ||
1284 | The option @samp{--alternate-editor=@var{command}} is useful when | |
1285 | running @code{emacsclient} in a script. It specifies a command to run | |
1286 | if @code{emacsclient} fails to contact Emacs. For example, the | |
1287 | following setting for the @var{EDITOR} environment variable will | |
1288 | always give an editor, even if Emacs is not running: | |
6bf7aab6 | 1289 | |
df9d7630 RS |
1290 | @example |
1291 | EDITOR="emacsclient --alternate-editor vi +%d %s" | |
1292 | @end example | |
6bf7aab6 | 1293 | |
df9d7630 RS |
1294 | @noindent |
1295 | The environment variable @var{ALTERNATE_EDITOR} has the same effect, but | |
1296 | the value of the @samp{--alternate-editor} takes precedence. | |
1297 | ||
1298 | @pindex emacs.bash | |
1299 | Alternatively, the file @file{etc/emacs.bash} defines a bash | |
1300 | function which will communicate with a running Emacs server, or start | |
1301 | one if none exists. | |
6bf7aab6 | 1302 | |
5b8b9fa7 SM |
1303 | If you use several displays, you can tell Emacs on which display to |
1304 | open the given files with the option @samp{--display=@var{DISPLAY}}. | |
1305 | This can be used typically when connecting from home to an Emacs | |
1306 | server running on your machine at your workplace. | |
1307 | ||
1308 | You can also use @code{emacsclient} to execute any piece of Emacs Lisp | |
1309 | code, using the option @samp{--eval}. When this option is given, the | |
1310 | rest of the arguments is not taken as a list of files to visit but as | |
1311 | a list of expressions to evaluate. | |
1312 | ||
3b65ce47 | 1313 | @node Hardcopy, PostScript, Emacs Server, Top |
6bf7aab6 DL |
1314 | @section Hardcopy Output |
1315 | @cindex hardcopy | |
1316 | ||
1317 | The Emacs commands for making hardcopy let you print either an entire | |
1318 | buffer or just part of one, either with or without page headers. | |
1319 | See also the hardcopy commands of Dired (@pxref{Misc File Ops}) | |
1320 | and the diary (@pxref{Diary Commands}). | |
1321 | ||
1322 | @table @kbd | |
1323 | @item M-x print-buffer | |
1324 | Print hardcopy of current buffer with page headings containing the file | |
1325 | name and page number. | |
1326 | @item M-x lpr-buffer | |
1327 | Print hardcopy of current buffer without page headings. | |
1328 | @item M-x print-region | |
1329 | Like @code{print-buffer} but print only the current region. | |
1330 | @item M-x lpr-region | |
1331 | Like @code{lpr-buffer} but print only the current region. | |
1332 | @end table | |
1333 | ||
1334 | @findex print-buffer | |
1335 | @findex print-region | |
1336 | @findex lpr-buffer | |
1337 | @findex lpr-region | |
1338 | @vindex lpr-switches | |
1339 | The hardcopy commands (aside from the Postscript commands) pass extra | |
1340 | switches to the @code{lpr} program based on the value of the variable | |
1341 | @code{lpr-switches}. Its value should be a list of strings, each string | |
1342 | an option starting with @samp{-}. For example, to specify a line width | |
1343 | of 80 columns for all the printing you do in Emacs, set | |
1344 | @code{lpr-switches} like this: | |
1345 | ||
1346 | @example | |
1347 | (setq lpr-switches '("-w80")) | |
1348 | @end example | |
1349 | ||
1350 | @vindex printer-name | |
1351 | You can specify the printer to use by setting the variable | |
1352 | @code{printer-name}. | |
1353 | ||
1354 | @vindex lpr-headers-switches | |
1355 | @vindex lpr-commands | |
1356 | @vindex lpr-add-switches | |
1357 | The variable @code{lpr-command} specifies the name of the printer | |
1358 | program to run; the default value depends on your operating system type. | |
1359 | On most systems, the default is @code{"lpr"}. The variable | |
1360 | @code{lpr-headers-switches} similarly specifies the extra switches to | |
1361 | use to make page headers. The variable @code{lpr-add-switches} controls | |
1362 | whether to supply @samp{-T} and @samp{-J} options (suitable for | |
1363 | @code{lpr}) to the printer program: @code{nil} means don't add them. | |
1364 | @code{lpr-add-switches} should be @code{nil} if your printer program is | |
1365 | not compatible with @code{lpr}. | |
1366 | ||
3b65ce47 DL |
1367 | @node PostScript, PostScript Variables, Hardcopy, Top |
1368 | @section PostScript Hardcopy | |
6bf7aab6 | 1369 | |
3b65ce47 | 1370 | These commands convert buffer contents to PostScript, |
6bf7aab6 DL |
1371 | either printing it or leaving it in another Emacs buffer. |
1372 | ||
1373 | @table @kbd | |
1374 | @item M-x ps-print-buffer | |
3b65ce47 | 1375 | Print hardcopy of the current buffer in PostScript form. |
6bf7aab6 | 1376 | @item M-x ps-print-region |
3b65ce47 | 1377 | Print hardcopy of the current region in PostScript form. |
6bf7aab6 | 1378 | @item M-x ps-print-buffer-with-faces |
3b65ce47 DL |
1379 | Print hardcopy of the current buffer in PostScript form, showing the |
1380 | faces used in the text by means of PostScript features. | |
6bf7aab6 | 1381 | @item M-x ps-print-region-with-faces |
3b65ce47 | 1382 | Print hardcopy of the current region in PostScript form, showing the |
6bf7aab6 DL |
1383 | faces used in the text. |
1384 | @item M-x ps-spool-buffer | |
3b65ce47 | 1385 | Generate PostScript for the current buffer text. |
6bf7aab6 | 1386 | @item M-x ps-spool-region |
3b65ce47 | 1387 | Generate PostScript for the current region. |
6bf7aab6 | 1388 | @item M-x ps-spool-buffer-with-faces |
3b65ce47 | 1389 | Generate PostScript for the current buffer, showing the faces used. |
6bf7aab6 | 1390 | @item M-x ps-spool-region-with-faces |
3b65ce47 DL |
1391 | Generate PostScript for the current region, showing the faces used. |
1392 | @item M-x handwrite | |
1393 | Generates/prints PostScript for the current buffer as if handwritten. | |
6bf7aab6 DL |
1394 | @end table |
1395 | ||
1396 | @findex ps-print-region | |
1397 | @findex ps-print-buffer | |
1398 | @findex ps-print-region-with-faces | |
1399 | @findex ps-print-buffer-with-faces | |
3b65ce47 DL |
1400 | The PostScript commands, @code{ps-print-buffer} and |
1401 | @code{ps-print-region}, print buffer contents in PostScript form. One | |
6bf7aab6 DL |
1402 | command prints the entire buffer; the other, just the region. The |
1403 | corresponding @samp{-with-faces} commands, | |
1404 | @code{ps-print-buffer-with-faces} and @code{ps-print-region-with-faces}, | |
3b65ce47 | 1405 | use PostScript features to show the faces (fonts and colors) in the text |
6bf7aab6 DL |
1406 | properties of the text being printed. |
1407 | ||
1408 | If you are using a color display, you can print a buffer of program | |
1409 | code with color highlighting by turning on Font-Lock mode in that | |
1410 | buffer, and using @code{ps-print-buffer-with-faces}. | |
1411 | ||
1412 | @findex ps-spool-region | |
1413 | @findex ps-spool-buffer | |
1414 | @findex ps-spool-region-with-faces | |
1415 | @findex ps-spool-buffer-with-faces | |
1416 | The commands whose names have @samp{spool} instead of @samp{print} | |
3b65ce47 | 1417 | generate the PostScript output in an Emacs buffer instead of sending |
6bf7aab6 DL |
1418 | it to the printer. |
1419 | ||
3b65ce47 DL |
1420 | @findex handwrite |
1421 | @cindex handwriting | |
1422 | @kbd{M-x handwrite} is more frivolous. It generates a PostScript | |
1423 | rendition of the current buffer as a cursive handwritten document. It | |
fc98b4ba RS |
1424 | can be customized in group @code{handwrite}. This function only |
1425 | supports ISO 8859-1 characters. | |
3b65ce47 | 1426 | |
6bf7aab6 DL |
1427 | @ifinfo |
1428 | The following section describes variables for customizing these commands. | |
1429 | @end ifinfo | |
1430 | ||
3b65ce47 DL |
1431 | @node PostScript Variables, Sorting, PostScript, Top |
1432 | @section Variables for PostScript Hardcopy | |
6bf7aab6 DL |
1433 | |
1434 | @vindex ps-lpr-command | |
1435 | @vindex ps-lpr-switches | |
1436 | @vindex ps-printer-name | |
3b65ce47 | 1437 | All the PostScript hardcopy commands use the variables |
6bf7aab6 DL |
1438 | @code{ps-lpr-command} and @code{ps-lpr-switches} to specify how to print |
1439 | the output. @code{ps-lpr-command} specifies the command name to run, | |
1440 | @code{ps-lpr-switches} specifies command line options to use, and | |
1441 | @code{ps-printer-name} specifies the printer. If you don't set the | |
1442 | first two variables yourself, they take their initial values from | |
1443 | @code{lpr-command} and @code{lpr-switches}. If @code{ps-printer-name} | |
1444 | is @code{nil}, @code{printer-name} is used. | |
1445 | ||
1446 | @vindex ps-print-header | |
6bf7aab6 DL |
1447 | The variable @code{ps-print-header} controls whether these commands |
1448 | add header lines to each page---set it to @code{nil} to turn headers | |
550135d1 EZ |
1449 | off. |
1450 | ||
1451 | @cindex color emulation on black-and-white printers | |
1452 | @vindex ps-print-color-p | |
1453 | If your printer doesn't support colors, you should turn off color | |
1454 | processing by setting @code{ps-print-color-p} to @code{nil}. By | |
1455 | default, if the display supports colors, Emacs produces hardcopy output | |
1456 | with color information; on black-and-white printers, colors are emulated | |
1457 | with shades of gray. This might produce illegible output, even if your | |
1458 | screen colors only use shades of gray. | |
1459 | ||
1460 | @vindex ps-use-face-background | |
df9d7630 RS |
1461 | By default, PostScript printing ignores the background colors of the |
1462 | faces, unless the variable @code{ps-use-face-background} is | |
1463 | non-@code{nil}. This is to avoid unwanted interference with the zebra | |
1464 | stripes and background image/text. | |
6bf7aab6 DL |
1465 | |
1466 | @vindex ps-paper-type | |
1467 | @vindex ps-page-dimensions-database | |
1468 | The variable @code{ps-paper-type} specifies which size of paper to | |
1469 | format for; legitimate values include @code{a4}, @code{a3}, | |
1470 | @code{a4small}, @code{b4}, @code{b5}, @code{executive}, @code{ledger}, | |
1471 | @code{legal}, @code{letter}, @code{letter-small}, @code{statement}, | |
1472 | @code{tabloid}. The default is @code{letter}. You can define | |
1473 | additional paper sizes by changing the variable | |
1474 | @code{ps-page-dimensions-database}. | |
1475 | ||
1476 | @vindex ps-landscape-mode | |
1477 | The variable @code{ps-landscape-mode} specifies the orientation of | |
1478 | printing on the page. The default is @code{nil}, which stands for | |
1479 | ``portrait'' mode. Any non-@code{nil} value specifies ``landscape'' | |
1480 | mode. | |
1481 | ||
1482 | @vindex ps-number-of-columns | |
1483 | The variable @code{ps-number-of-columns} specifies the number of | |
1484 | columns; it takes effect in both landscape and portrait mode. The | |
1485 | default is 1. | |
1486 | ||
1487 | @vindex ps-font-family | |
1488 | @vindex ps-font-size | |
1489 | @vindex ps-font-info-database | |
1490 | The variable @code{ps-font-family} specifies which font family to use | |
1491 | for printing ordinary text. Legitimate values include @code{Courier}, | |
1492 | @code{Helvetica}, @code{NewCenturySchlbk}, @code{Palatino} and | |
1493 | @code{Times}. The variable @code{ps-font-size} specifies the size of | |
1494 | the font for ordinary text. It defaults to 8.5 points. | |
1495 | ||
adee28ff EZ |
1496 | @vindex ps-multibyte-buffer |
1497 | @cindex Intlfonts for PostScript printing | |
1498 | @cindex fonts for PostScript printing | |
1499 | Emacs supports more scripts and characters than a typical PostScript | |
1500 | printer. Thus, some of the characters in your buffer might not be | |
1501 | printable using the fonts built into your printer. You can augment | |
1502 | the fonts supplied with the printer with those from the GNU Intlfonts | |
1503 | package, or you can instruct Emacs to use Intlfonts exclusively. The | |
1504 | variable @code{ps-multibyte-buffer} controls this: the default value, | |
6b61353c | 1505 | @code{nil}, is appropriate for printing @acronym{ASCII} and Latin-1 |
adee28ff | 1506 | characters; a value of @code{non-latin-printer} is for printers which |
6b61353c | 1507 | have the fonts for @acronym{ASCII}, Latin-1, Japanese, and Korean |
adee28ff EZ |
1508 | characters built into them. A value of @code{bdf-font} arranges for |
1509 | the BDF fonts from the Intlfonts package to be used for @emph{all} | |
1510 | characters. Finally, a value of @code{bdf-font-except-latin} | |
6b61353c | 1511 | instructs the printer to use built-in fonts for @acronym{ASCII} and Latin-1 |
adee28ff EZ |
1512 | characters, and Intlfonts BDF fonts for the rest. |
1513 | ||
1514 | @vindex bdf-directory-list | |
021037cb | 1515 | To be able to use the BDF fonts, Emacs needs to know where to find |
adee28ff EZ |
1516 | them. The variable @code{bdf-directory-list} holds the list of |
1517 | directories where Emacs should look for the fonts; the default value | |
1518 | includes a single directory @file{/usr/local/share/emacs/fonts/bdf}. | |
1519 | ||
6bf7aab6 | 1520 | Many other customization variables for these commands are defined and |
adee28ff | 1521 | described in the Lisp files @file{ps-print.el} and @file{ps-mule.el}. |
6bf7aab6 | 1522 | |
3b65ce47 | 1523 | @node Sorting, Narrowing, PostScript Variables, Top |
6bf7aab6 DL |
1524 | @section Sorting Text |
1525 | @cindex sorting | |
1526 | ||
1527 | Emacs provides several commands for sorting text in the buffer. All | |
1528 | operate on the contents of the region (the text between point and the | |
1529 | mark). They divide the text of the region into many @dfn{sort records}, | |
1530 | identify a @dfn{sort key} for each record, and then reorder the records | |
1531 | into the order determined by the sort keys. The records are ordered so | |
1532 | that their keys are in alphabetical order, or, for numeric sorting, in | |
1533 | numeric order. In alphabetic sorting, all upper-case letters `A' through | |
6b61353c | 1534 | `Z' come before lower-case `a', in accord with the @acronym{ASCII} character |
6bf7aab6 DL |
1535 | sequence. |
1536 | ||
1537 | The various sort commands differ in how they divide the text into sort | |
1538 | records and in which part of each record is used as the sort key. Most of | |
1539 | the commands make each line a separate sort record, but some commands use | |
1540 | paragraphs or pages as sort records. Most of the sort commands use each | |
1541 | entire sort record as its own sort key, but some use only a portion of the | |
1542 | record as the sort key. | |
1543 | ||
1544 | @findex sort-lines | |
1545 | @findex sort-paragraphs | |
1546 | @findex sort-pages | |
1547 | @findex sort-fields | |
1548 | @findex sort-numeric-fields | |
efd68b8a | 1549 | @vindex sort-numeric-base |
6bf7aab6 DL |
1550 | @table @kbd |
1551 | @item M-x sort-lines | |
1552 | Divide the region into lines, and sort by comparing the entire | |
1553 | text of a line. A numeric argument means sort into descending order. | |
1554 | ||
1555 | @item M-x sort-paragraphs | |
1556 | Divide the region into paragraphs, and sort by comparing the entire | |
1557 | text of a paragraph (except for leading blank lines). A numeric | |
1558 | argument means sort into descending order. | |
1559 | ||
1560 | @item M-x sort-pages | |
1561 | Divide the region into pages, and sort by comparing the entire | |
1562 | text of a page (except for leading blank lines). A numeric | |
1563 | argument means sort into descending order. | |
1564 | ||
1565 | @item M-x sort-fields | |
1566 | Divide the region into lines, and sort by comparing the contents of | |
1567 | one field in each line. Fields are defined as separated by | |
1568 | whitespace, so the first run of consecutive non-whitespace characters | |
1569 | in a line constitutes field 1, the second such run constitutes field | |
1570 | 2, etc. | |
1571 | ||
1572 | Specify which field to sort by with a numeric argument: 1 to sort by | |
1573 | field 1, etc. A negative argument means count fields from the right | |
1574 | instead of from the left; thus, minus 1 means sort by the last field. | |
1575 | If several lines have identical contents in the field being sorted, they | |
021037cb | 1576 | keep the same relative order that they had in the original buffer. |
6bf7aab6 DL |
1577 | |
1578 | @item M-x sort-numeric-fields | |
1579 | Like @kbd{M-x sort-fields} except the specified field is converted | |
1580 | to an integer for each line, and the numbers are compared. @samp{10} | |
1581 | comes before @samp{2} when considered as text, but after it when | |
efd68b8a GM |
1582 | considered as a number. By default, numbers are interpreted according |
1583 | to @code{sort-numeric-base}, but numbers beginning with @samp{0x} or | |
1584 | @samp{0} are interpreted as hexadecimal and octal, respectively. | |
6bf7aab6 DL |
1585 | |
1586 | @item M-x sort-columns | |
1587 | Like @kbd{M-x sort-fields} except that the text within each line | |
1588 | used for comparison comes from a fixed range of columns. See below | |
1589 | for an explanation. | |
1590 | ||
1591 | @item M-x reverse-region | |
1592 | Reverse the order of the lines in the region. This is useful for | |
1593 | sorting into descending order by fields or columns, since those sort | |
1594 | commands do not have a feature for doing that. | |
1595 | @end table | |
1596 | ||
1597 | For example, if the buffer contains this: | |
1598 | ||
1599 | @smallexample | |
1600 | On systems where clash detection (locking of files being edited) is | |
1601 | implemented, Emacs also checks the first time you modify a buffer | |
1602 | whether the file has changed on disk since it was last visited or | |
1603 | saved. If it has, you are asked to confirm that you want to change | |
1604 | the buffer. | |
1605 | @end smallexample | |
1606 | ||
1607 | @noindent | |
1608 | applying @kbd{M-x sort-lines} to the entire buffer produces this: | |
1609 | ||
1610 | @smallexample | |
1611 | On systems where clash detection (locking of files being edited) is | |
1612 | implemented, Emacs also checks the first time you modify a buffer | |
1613 | saved. If it has, you are asked to confirm that you want to change | |
1614 | the buffer. | |
1615 | whether the file has changed on disk since it was last visited or | |
1616 | @end smallexample | |
1617 | ||
1618 | @noindent | |
1619 | where the upper-case @samp{O} sorts before all lower-case letters. If | |
1620 | you use @kbd{C-u 2 M-x sort-fields} instead, you get this: | |
1621 | ||
1622 | @smallexample | |
1623 | implemented, Emacs also checks the first time you modify a buffer | |
1624 | saved. If it has, you are asked to confirm that you want to change | |
1625 | the buffer. | |
1626 | On systems where clash detection (locking of files being edited) is | |
1627 | whether the file has changed on disk since it was last visited or | |
1628 | @end smallexample | |
1629 | ||
1630 | @noindent | |
1631 | where the sort keys were @samp{Emacs}, @samp{If}, @samp{buffer}, | |
1632 | @samp{systems} and @samp{the}. | |
1633 | ||
1634 | @findex sort-columns | |
1635 | @kbd{M-x sort-columns} requires more explanation. You specify the | |
1636 | columns by putting point at one of the columns and the mark at the other | |
1637 | column. Because this means you cannot put point or the mark at the | |
1638 | beginning of the first line of the text you want to sort, this command | |
2684ed46 | 1639 | uses an unusual definition of ``region'': all of the line point is in is |
6bf7aab6 DL |
1640 | considered part of the region, and so is all of the line the mark is in, |
1641 | as well as all the lines in between. | |
1642 | ||
1643 | For example, to sort a table by information found in columns 10 to 15, | |
1644 | you could put the mark on column 10 in the first line of the table, and | |
1645 | point on column 15 in the last line of the table, and then run | |
1646 | @code{sort-columns}. Equivalently, you could run it with the mark on | |
1647 | column 15 in the first line and point on column 10 in the last line. | |
1648 | ||
1649 | This can be thought of as sorting the rectangle specified by point and | |
1650 | the mark, except that the text on each line to the left or right of the | |
1651 | rectangle moves along with the text inside the rectangle. | |
1652 | @xref{Rectangles}. | |
1653 | ||
1654 | @vindex sort-fold-case | |
1655 | Many of the sort commands ignore case differences when comparing, if | |
1656 | @code{sort-fold-case} is non-@code{nil}. | |
1657 | ||
1658 | @node Narrowing, Two-Column, Sorting, Top | |
1659 | @section Narrowing | |
1660 | @cindex widening | |
1661 | @cindex restriction | |
1662 | @cindex narrowing | |
1663 | @cindex accessible portion | |
1664 | ||
1665 | @dfn{Narrowing} means focusing in on some portion of the buffer, | |
1666 | making the rest temporarily inaccessible. The portion which you can | |
1667 | still get to is called the @dfn{accessible portion}. Canceling the | |
1668 | narrowing, which makes the entire buffer once again accessible, is | |
1669 | called @dfn{widening}. The amount of narrowing in effect in a buffer at | |
1670 | any time is called the buffer's @dfn{restriction}. | |
1671 | ||
1672 | Narrowing can make it easier to concentrate on a single subroutine or | |
1673 | paragraph by eliminating clutter. It can also be used to restrict the | |
1674 | range of operation of a replace command or repeating keyboard macro. | |
1675 | ||
6bf7aab6 DL |
1676 | @table @kbd |
1677 | @item C-x n n | |
1678 | Narrow down to between point and mark (@code{narrow-to-region}). | |
1679 | @item C-x n w | |
1680 | Widen to make the entire buffer accessible again (@code{widen}). | |
1681 | @item C-x n p | |
1682 | Narrow down to the current page (@code{narrow-to-page}). | |
1683 | @item C-x n d | |
1684 | Narrow down to the current defun (@code{narrow-to-defun}). | |
1685 | @end table | |
1686 | ||
1687 | When you have narrowed down to a part of the buffer, that part appears | |
1688 | to be all there is. You can't see the rest, you can't move into it | |
1689 | (motion commands won't go outside the accessible part), you can't change | |
1690 | it in any way. However, it is not gone, and if you save the file all | |
1691 | the inaccessible text will be saved. The word @samp{Narrow} appears in | |
1692 | the mode line whenever narrowing is in effect. | |
1693 | ||
1694 | @kindex C-x n n | |
1695 | @findex narrow-to-region | |
1696 | The primary narrowing command is @kbd{C-x n n} (@code{narrow-to-region}). | |
1697 | It sets the current buffer's restrictions so that the text in the current | |
021037cb EZ |
1698 | region remains accessible, but all text before the region or after the |
1699 | region is inaccessible. Point and mark do not change. | |
6bf7aab6 DL |
1700 | |
1701 | @kindex C-x n p | |
1702 | @findex narrow-to-page | |
1703 | @kindex C-x n d | |
1704 | @findex narrow-to-defun | |
1705 | Alternatively, use @kbd{C-x n p} (@code{narrow-to-page}) to narrow | |
1706 | down to the current page. @xref{Pages}, for the definition of a page. | |
1707 | @kbd{C-x n d} (@code{narrow-to-defun}) narrows down to the defun | |
1708 | containing point (@pxref{Defuns}). | |
1709 | ||
1710 | @kindex C-x n w | |
1711 | @findex widen | |
1712 | The way to cancel narrowing is to widen with @kbd{C-x n w} | |
1713 | (@code{widen}). This makes all text in the buffer accessible again. | |
1714 | ||
1715 | You can get information on what part of the buffer you are narrowed down | |
1716 | to using the @kbd{C-x =} command. @xref{Position Info}. | |
1717 | ||
1718 | Because narrowing can easily confuse users who do not understand it, | |
1719 | @code{narrow-to-region} is normally a disabled command. Attempting to use | |
1720 | this command asks for confirmation and gives you the option of enabling it; | |
1721 | if you enable the command, confirmation will no longer be required for | |
1722 | it. @xref{Disabling}. | |
1723 | ||
1724 | @node Two-Column, Editing Binary Files, Narrowing, Top | |
1725 | @section Two-Column Editing | |
1726 | @cindex two-column editing | |
1727 | @cindex splitting columns | |
1728 | @cindex columns, splitting | |
1729 | ||
1730 | Two-column mode lets you conveniently edit two side-by-side columns of | |
1731 | text. It uses two side-by-side windows, each showing its own | |
1732 | buffer. | |
1733 | ||
1734 | There are three ways to enter two-column mode: | |
1735 | ||
1736 | @table @asis | |
1737 | @item @kbd{@key{F2} 2} or @kbd{C-x 6 2} | |
1738 | @kindex F2 2 | |
1739 | @kindex C-x 6 2 | |
1740 | @findex 2C-two-columns | |
1741 | Enter two-column mode with the current buffer on the left, and on the | |
1742 | right, a buffer whose name is based on the current buffer's name | |
1743 | (@code{2C-two-columns}). If the right-hand buffer doesn't already | |
1744 | exist, it starts out empty; the current buffer's contents are not | |
1745 | changed. | |
1746 | ||
1747 | This command is appropriate when the current buffer is empty or contains | |
1748 | just one column and you want to add another column. | |
1749 | ||
1750 | @item @kbd{@key{F2} s} or @kbd{C-x 6 s} | |
1751 | @kindex F2 s | |
1752 | @kindex C-x 6 s | |
1753 | @findex 2C-split | |
1754 | Split the current buffer, which contains two-column text, into two | |
1755 | buffers, and display them side by side (@code{2C-split}). The current | |
1756 | buffer becomes the left-hand buffer, but the text in the right-hand | |
1757 | column is moved into the right-hand buffer. The current column | |
1758 | specifies the split point. Splitting starts with the current line and | |
1759 | continues to the end of the buffer. | |
1760 | ||
1761 | This command is appropriate when you have a buffer that already contains | |
1762 | two-column text, and you wish to separate the columns temporarily. | |
1763 | ||
1764 | @item @kbd{@key{F2} b @var{buffer} @key{RET}} | |
1765 | @itemx @kbd{C-x 6 b @var{buffer} @key{RET}} | |
1766 | @kindex F2 b | |
1767 | @kindex C-x 6 b | |
1768 | @findex 2C-associate-buffer | |
1769 | Enter two-column mode using the current buffer as the left-hand buffer, | |
1770 | and using buffer @var{buffer} as the right-hand buffer | |
1771 | (@code{2C-associate-buffer}). | |
1772 | @end table | |
1773 | ||
1774 | @kbd{@key{F2} s} or @kbd{C-x 6 s} looks for a column separator, which | |
1775 | is a string that appears on each line between the two columns. You can | |
1776 | specify the width of the separator with a numeric argument to | |
1777 | @kbd{@key{F2} s}; that many characters, before point, constitute the | |
1778 | separator string. By default, the width is 1, so the column separator | |
1779 | is the character before point. | |
1780 | ||
1781 | When a line has the separator at the proper place, @kbd{@key{F2} s} | |
1782 | puts the text after the separator into the right-hand buffer, and | |
1783 | deletes the separator. Lines that don't have the column separator at | |
1784 | the proper place remain unsplit; they stay in the left-hand buffer, and | |
1785 | the right-hand buffer gets an empty line to correspond. (This is the | |
1786 | way to write a line that ``spans both columns while in two-column | |
1787 | mode'': write it in the left-hand buffer, and put an empty line in the | |
1788 | right-hand buffer.) | |
1789 | ||
1790 | @kindex F2 RET | |
1791 | @kindex C-x 6 RET | |
1792 | @findex 2C-newline | |
1793 | The command @kbd{C-x 6 @key{RET}} or @kbd{@key{F2} @key{RET}} | |
1794 | (@code{2C-newline}) inserts a newline in each of the two buffers at | |
1795 | corresponding positions. This is the easiest way to add a new line to | |
1796 | the two-column text while editing it in split buffers. | |
1797 | ||
1798 | @kindex F2 1 | |
1799 | @kindex C-x 6 1 | |
1800 | @findex 2C-merge | |
1801 | When you have edited both buffers as you wish, merge them with | |
1802 | @kbd{@key{F2} 1} or @kbd{C-x 6 1} (@code{2C-merge}). This copies the | |
1803 | text from the right-hand buffer as a second column in the other buffer. | |
1804 | To go back to two-column editing, use @kbd{@key{F2} s}. | |
1805 | ||
1806 | @kindex F2 d | |
1807 | @kindex C-x 6 d | |
1808 | @findex 2C-dissociate | |
1809 | Use @kbd{@key{F2} d} or @kbd{C-x 6 d} to dissociate the two buffers, | |
1810 | leaving each as it stands (@code{2C-dissociate}). If the other buffer, | |
1811 | the one not current when you type @kbd{@key{F2} d}, is empty, | |
1812 | @kbd{@key{F2} d} kills it. | |
1813 | ||
1814 | @node Editing Binary Files, Saving Emacs Sessions, Two-Column, Top | |
1815 | @section Editing Binary Files | |
1816 | ||
1817 | @cindex Hexl mode | |
1818 | @cindex mode, Hexl | |
1819 | @cindex editing binary files | |
c965d0ac | 1820 | @cindex hex editing |
6bf7aab6 DL |
1821 | There is a special major mode for editing binary files: Hexl mode. To |
1822 | use it, use @kbd{M-x hexl-find-file} instead of @kbd{C-x C-f} to visit | |
1823 | the file. This command converts the file's contents to hexadecimal and | |
1824 | lets you edit the translation. When you save the file, it is converted | |
1825 | automatically back to binary. | |
1826 | ||
1827 | You can also use @kbd{M-x hexl-mode} to translate an existing buffer | |
1828 | into hex. This is useful if you visit a file normally and then discover | |
1829 | it is a binary file. | |
1830 | ||
1831 | Ordinary text characters overwrite in Hexl mode. This is to reduce | |
1832 | the risk of accidentally spoiling the alignment of data in the file. | |
1833 | There are special commands for insertion. Here is a list of the | |
1834 | commands of Hexl mode: | |
1835 | ||
1836 | @c I don't think individual index entries for these commands are useful--RMS. | |
1837 | @table @kbd | |
1838 | @item C-M-d | |
1839 | Insert a byte with a code typed in decimal. | |
1840 | ||
1841 | @item C-M-o | |
1842 | Insert a byte with a code typed in octal. | |
1843 | ||
1844 | @item C-M-x | |
1845 | Insert a byte with a code typed in hex. | |
1846 | ||
1847 | @item C-x [ | |
1848 | Move to the beginning of a 1k-byte ``page.'' | |
1849 | ||
1850 | @item C-x ] | |
1851 | Move to the end of a 1k-byte ``page.'' | |
1852 | ||
1853 | @item M-g | |
1854 | Move to an address specified in hex. | |
1855 | ||
1856 | @item M-j | |
1857 | Move to an address specified in decimal. | |
1858 | ||
1859 | @item C-c C-c | |
1860 | Leave Hexl mode, going back to the major mode this buffer had before you | |
1861 | invoked @code{hexl-mode}. | |
1862 | @end table | |
1863 | ||
c965d0ac | 1864 | @noindent |
fc98b4ba | 1865 | Other Hexl commands let you insert strings (sequences) of binary |
021037cb EZ |
1866 | bytes, move by @code{short}s or @code{int}s, etc.; type @kbd{C-h a |
1867 | hexl-@key{RET}} for details. | |
c965d0ac EZ |
1868 | |
1869 | ||
6bf7aab6 DL |
1870 | @node Saving Emacs Sessions, Recursive Edit, Editing Binary Files, Top |
1871 | @section Saving Emacs Sessions | |
1872 | @cindex saving sessions | |
24cd2514 EZ |
1873 | @cindex restore session |
1874 | @cindex remember editing session | |
1875 | @cindex reload files | |
6bf7aab6 DL |
1876 | @cindex desktop |
1877 | ||
6b61353c KH |
1878 | Use the desktop library to save the state of Emacs from one session |
1879 | to another. Once you save the Emacs @dfn{desktop}---the buffers, | |
1880 | their file names, major modes, buffer positions, and so on---then | |
1881 | subsequent Emacs sessions reload the saved desktop. | |
6bf7aab6 | 1882 | |
6b61353c KH |
1883 | @findex desktop-save |
1884 | @vindex desktop-save-mode | |
1885 | You can save the desktop manually with the command @kbd{M-x | |
1886 | desktop-save}. You can also enable automatical desktop saving when | |
1887 | you exit Emacs: use the Customization buffer (@pxref{Easy | |
1888 | Customization}) to set @code{desktop-save-mode} to @code{t} for future | |
1889 | sessions, or add this line in your @file{~/.emacs} file: | |
6bf7aab6 DL |
1890 | |
1891 | @example | |
6b61353c | 1892 | (desktop-save-mode 1) |
6bf7aab6 DL |
1893 | @end example |
1894 | ||
6b61353c KH |
1895 | @findex desktop-change-dir |
1896 | @findex desktop-revert | |
1897 | When Emacs starts, it looks for a saved desktop in the current | |
1898 | directory. Thus, you can have separate saved desktops in different | |
1899 | directories, and the starting directory determines which one Emacs | |
1900 | reloads. You can save the current desktop and reload one saved in | |
1901 | another directory by typing @kbd{M-x desktop-change-dir}. Typing | |
1902 | @kbd{M-x desktop-revert} reverts to the desktop previously reloaded. | |
1903 | ||
1904 | Specify the option @samp{--no-desktop} on the command line when you | |
1905 | don't want it to reload any saved desktop. | |
1906 | ||
1907 | @findex desktop-clear | |
1908 | @vindex desktop-globals-to-clear | |
1909 | @vindex desktop-clear-preserve-buffers-regexp | |
1910 | Type @kbd{M-x desktop-clear} to empty the Emacs desktop. This kills | |
1911 | all buffers except for internal ones, and clears the global variables | |
1912 | listed in @code{desktop-globals-to-clear}. If you want this to | |
1913 | preserve certain buffers, customize the variable | |
1914 | @code{desktop-clear-preserve-buffers-regexp}, whose value is a regular | |
1915 | expression matching the names of buffers not to kill. | |
17a4f5ec | 1916 | |
6bf7aab6 DL |
1917 | @node Recursive Edit, Emulation, Saving Emacs Sessions, Top |
1918 | @section Recursive Editing Levels | |
1919 | @cindex recursive editing level | |
1920 | @cindex editing level, recursive | |
1921 | ||
1922 | A @dfn{recursive edit} is a situation in which you are using Emacs | |
1923 | commands to perform arbitrary editing while in the middle of another | |
1924 | Emacs command. For example, when you type @kbd{C-r} inside of a | |
1925 | @code{query-replace}, you enter a recursive edit in which you can change | |
1926 | the current buffer. On exiting from the recursive edit, you go back to | |
1927 | the @code{query-replace}. | |
1928 | ||
1929 | @kindex C-M-c | |
1930 | @findex exit-recursive-edit | |
1931 | @cindex exiting recursive edit | |
1932 | @dfn{Exiting} the recursive edit means returning to the unfinished | |
1933 | command, which continues execution. The command to exit is @kbd{C-M-c} | |
1934 | (@code{exit-recursive-edit}). | |
1935 | ||
1936 | You can also @dfn{abort} the recursive edit. This is like exiting, | |
1937 | but also quits the unfinished command immediately. Use the command | |
1938 | @kbd{C-]} (@code{abort-recursive-edit}) to do this. @xref{Quitting}. | |
1939 | ||
1940 | The mode line shows you when you are in a recursive edit by displaying | |
1941 | square brackets around the parentheses that always surround the major and | |
021037cb | 1942 | minor mode names. Every window's mode line shows this in the same way, |
6bf7aab6 DL |
1943 | since being in a recursive edit is true of Emacs as a whole rather than |
1944 | any particular window or buffer. | |
1945 | ||
1946 | It is possible to be in recursive edits within recursive edits. For | |
1947 | example, after typing @kbd{C-r} in a @code{query-replace}, you may type a | |
1948 | command that enters the debugger. This begins a recursive editing level | |
1949 | for the debugger, within the recursive editing level for @kbd{C-r}. | |
1950 | Mode lines display a pair of square brackets for each recursive editing | |
1951 | level currently in progress. | |
1952 | ||
1953 | Exiting the inner recursive edit (such as, with the debugger @kbd{c} | |
1954 | command) resumes the command running in the next level up. When that | |
1955 | command finishes, you can then use @kbd{C-M-c} to exit another recursive | |
1956 | editing level, and so on. Exiting applies to the innermost level only. | |
1957 | Aborting also gets out of only one level of recursive edit; it returns | |
1958 | immediately to the command level of the previous recursive edit. If you | |
1959 | wish, you can then abort the next recursive editing level. | |
1960 | ||
1961 | Alternatively, the command @kbd{M-x top-level} aborts all levels of | |
1962 | recursive edits, returning immediately to the top-level command reader. | |
1963 | ||
1964 | The text being edited inside the recursive edit need not be the same text | |
1965 | that you were editing at top level. It depends on what the recursive edit | |
1966 | is for. If the command that invokes the recursive edit selects a different | |
1967 | buffer first, that is the buffer you will edit recursively. In any case, | |
1968 | you can switch buffers within the recursive edit in the normal manner (as | |
1969 | long as the buffer-switching keys have not been rebound). You could | |
1970 | probably do all the rest of your editing inside the recursive edit, | |
1971 | visiting files and all. But this could have surprising effects (such as | |
1972 | stack overflow) from time to time. So remember to exit or abort the | |
1973 | recursive edit when you no longer need it. | |
1974 | ||
1975 | In general, we try to minimize the use of recursive editing levels in | |
1976 | GNU Emacs. This is because they constrain you to ``go back'' in a | |
1977 | particular order---from the innermost level toward the top level. When | |
1978 | possible, we present different activities in separate buffers so that | |
1979 | you can switch between them as you please. Some commands switch to a | |
1980 | new major mode which provides a command to switch back. These | |
1981 | approaches give you more flexibility to go back to unfinished tasks in | |
1982 | the order you choose. | |
1983 | ||
3f724e9a | 1984 | @node Emulation, Hyperlinking, Recursive Edit, Top |
6bf7aab6 DL |
1985 | @section Emulation |
1986 | @cindex emulating other editors | |
1987 | @cindex other editors | |
1988 | @cindex EDT | |
1989 | @cindex vi | |
d0960fb3 | 1990 | @cindex PC key bindings |
3b65ce47 | 1991 | @cindex scrolling all windows |
d0960fb3 RS |
1992 | @cindex PC selection |
1993 | @cindex Motif key bindings | |
1994 | @cindex Macintosh key bindings | |
3b65ce47 | 1995 | @cindex WordStar |
6bf7aab6 DL |
1996 | |
1997 | GNU Emacs can be programmed to emulate (more or less) most other | |
1998 | editors. Standard facilities can emulate these: | |
1999 | ||
2000 | @table @asis | |
3b65ce47 DL |
2001 | @item CRiSP/Brief (PC editor) |
2002 | @findex crisp-mode | |
2003 | @vindex crisp-override-meta-x | |
2004 | @findex scroll-all-mode | |
b1a92ebf DL |
2005 | @cindex CRiSP mode |
2006 | @cindex Brief emulation | |
4946337d | 2007 | @cindex emulation of Brief |
b1a92ebf | 2008 | @cindex mode, CRiSP |
d0960fb3 | 2009 | You can turn on key bindings to emulate the CRiSP/Brief editor with |
b1a92ebf DL |
2010 | @kbd{M-x crisp-mode}. Note that this rebinds @kbd{M-x} to exit Emacs |
2011 | unless you change the user option @code{crisp-override-meta-x}. You can | |
2012 | also use the command @kbd{M-x scroll-all-mode} or set the user option | |
2013 | @code{crisp-load-scroll-all} to emulate CRiSP's scroll-all feature | |
2014 | (scrolling all windows together). | |
3b65ce47 | 2015 | |
6bf7aab6 DL |
2016 | @item EDT (DEC VMS editor) |
2017 | @findex edt-emulation-on | |
2018 | @findex edt-emulation-off | |
2019 | Turn on EDT emulation with @kbd{M-x edt-emulation-on}. @kbd{M-x | |
2020 | edt-emulation-off} restores normal Emacs command bindings. | |
2021 | ||
2022 | Most of the EDT emulation commands are keypad keys, and most standard | |
2023 | Emacs key bindings are still available. The EDT emulation rebindings | |
2024 | are done in the global keymap, so there is no problem switching | |
2025 | buffers or major modes while in EDT emulation. | |
2026 | ||
2684ed46 | 2027 | @item ``PC'' bindings |
3b65ce47 | 2028 | @findex pc-bindings-mode |
2684ed46 | 2029 | @cindex ``PC'' key bindings |
df9d7630 RS |
2030 | The command @kbd{M-x pc-bindings-mode} sets up certain key bindings |
2031 | for ``PC compatibility''---what people are often used to on PCs---as | |
2032 | follows: @kbd{Delete} and its variants delete forward instead of | |
2033 | backward, @kbd{C-Backspace} kills backward a word (as @kbd{C-Delete} | |
2034 | normally would), @kbd{M-Backspace} does undo, @kbd{Home} and @kbd{End} | |
2035 | move to beginning and end of line, @kbd{C-Home} and @kbd{C-End} move | |
2036 | to beginning and end of buffer and @kbd{C-Escape} does | |
2037 | @code{list-buffers}. | |
3b65ce47 | 2038 | |
b1a92ebf | 2039 | @item PC Selection mode |
3b65ce47 | 2040 | @findex pc-selection-mode |
b1a92ebf DL |
2041 | @cindex PC Selection minor mode |
2042 | @cindex mode, PC selection | |
2684ed46 | 2043 | @cindex selection, PC |
8819154c | 2044 | The command @kbd{M-x pc-selection-mode} toggles a global minor mode |
df9d7630 | 2045 | that emulates the mark, copy, cut and paste commands of various other |
d0960fb3 | 2046 | systems---an interface known as CUA. It establishes the key bindings |
df9d7630 RS |
2047 | of PC mode, and also modifies the bindings of the cursor keys and the |
2048 | @kbd{next}, @kbd{prior}, @kbd{home} and @kbd{end} keys. It does not | |
d0960fb3 | 2049 | provide the full set of CUA key bindings---the fundamental Emacs keys |
df9d7630 RS |
2050 | @kbd{C-c}, @kbd{C-v} and @kbd{C-x} are not changed. |
2051 | ||
2052 | The standard keys for moving around (@kbd{right}, @kbd{left}, | |
2053 | @kbd{up}, @kbd{down}, @kbd{home}, @kbd{end}, @kbd{prior}, @kbd{next}, | |
2054 | called ``move-keys'') deactivate the mark in PC selection mode. | |
2055 | However, using @kbd{Shift} together with the ``move keys'' activates | |
2056 | the region over which they move. The copy, cut and paste functions | |
2057 | are available on @kbd{C-insert}, @kbd{S-delete} and @kbd{S-insert} | |
2058 | respectively. | |
3b65ce47 | 2059 | |
8819154c EZ |
2060 | Turning @code{pc-selection-mode} off restores the old key bindings of |
2061 | these keys. | |
2062 | ||
f4831bc7 | 2063 | @cindex s-region package |
3b65ce47 DL |
2064 | The @code{s-region} package provides similar, but less complete, |
2065 | facilities. | |
2066 | ||
3f724e9a DL |
2067 | @item TPU (DEC VMS editor) |
2068 | @findex tpu-edt-on | |
2069 | @cindex TPU | |
2070 | @kbd{M-x tpu-edt-on} turns on emulation of the TPU editor emulating EDT. | |
2071 | ||
6bf7aab6 DL |
2072 | @item vi (Berkeley editor) |
2073 | @findex viper-mode | |
2074 | Viper is the newest emulator for vi. It implements several levels of | |
2075 | emulation; level 1 is closest to vi itself, while level 5 departs | |
2076 | somewhat from strict emulation to take advantage of the capabilities of | |
2077 | Emacs. To invoke Viper, type @kbd{M-x viper-mode}; it will guide you | |
2078 | the rest of the way and ask for the emulation level. @inforef{Top, | |
2079 | Viper, viper}. | |
2080 | ||
2081 | @item vi (another emulator) | |
2082 | @findex vi-mode | |
2083 | @kbd{M-x vi-mode} enters a major mode that replaces the previously | |
2084 | established major mode. All of the vi commands that, in real vi, enter | |
2085 | ``input'' mode are programmed instead to return to the previous major | |
2086 | mode. Thus, ordinary Emacs serves as vi's ``input'' mode. | |
2087 | ||
2088 | Because vi emulation works through major modes, it does not work | |
2089 | to switch buffers during emulation. Return to normal Emacs first. | |
2090 | ||
2091 | If you plan to use vi emulation much, you probably want to bind a key | |
2092 | to the @code{vi-mode} command. | |
2093 | ||
2094 | @item vi (alternate emulator) | |
2095 | @findex vip-mode | |
2096 | @kbd{M-x vip-mode} invokes another vi emulator, said to resemble real vi | |
2097 | more thoroughly than @kbd{M-x vi-mode}. ``Input'' mode in this emulator | |
2098 | is changed from ordinary Emacs so you can use @key{ESC} to go back to | |
2099 | emulated vi command mode. To get from emulated vi command mode back to | |
2100 | ordinary Emacs, type @kbd{C-z}. | |
2101 | ||
2102 | This emulation does not work through major modes, and it is possible | |
2103 | to switch buffers in various ways within the emulator. It is not | |
2104 | so necessary to assign a key to the command @code{vip-mode} as | |
2105 | it is with @code{vi-mode} because terminating insert mode does | |
2106 | not use it. | |
2107 | ||
2108 | @inforef{Top, VIP, vip}, for full information. | |
3b65ce47 DL |
2109 | |
2110 | @item WordStar (old wordprocessor) | |
2111 | @findex wordstar-mode | |
2112 | @kbd{M-x wordstar-mode} provides a major mode with WordStar-like | |
d0960fb3 | 2113 | key bindings. |
6bf7aab6 DL |
2114 | @end table |
2115 | ||
3f724e9a DL |
2116 | @node Hyperlinking, Dissociated Press, Emulation, Top |
2117 | @section Hyperlinking and Navigation Features | |
2118 | ||
2119 | @cindex hyperlinking | |
3f724e9a | 2120 | @cindex navigation |
df9d7630 RS |
2121 | Various modes documented elsewhere have hypertext features so that |
2122 | you can follow links, usually by clicking @kbd{Mouse-2} on the link or | |
2123 | typing @key{RET} while point is on the link. Info mode, Help mode and | |
2124 | the Dired-like modes are examples. The Tags facility links between | |
2125 | uses and definitions in source files, see @ref{Tags}. Imenu provides | |
2126 | navigation amongst items indexed in the current buffer, see | |
2127 | @ref{Imenu}. Info-lookup provides mode-specific lookup of definitions | |
2128 | in Info indexes, see @ref{Documentation}. Speedbar maintains a frame | |
2129 | in which links to files, and locations in files are displayed, see | |
2130 | @ref{Speedbar}. | |
2131 | ||
2132 | Other non-mode-specific facilities described in this section enable | |
2133 | following links from the current buffer in a context-sensitive | |
2134 | fashion. | |
3f724e9a | 2135 | |
b1a92ebf DL |
2136 | @menu |
2137 | * Browse-URL:: Following URLs. | |
2138 | * Goto-address:: Activating URLs. | |
2139 | * FFAP:: Finding files etc. at point. | |
2140 | * Find-func:: Finding function and variable definitions. | |
2141 | @end menu | |
2142 | ||
2143 | @node Browse-URL | |
2144 | @subsection Following URLs | |
3f724e9a | 2145 | @cindex World Wide Web |
b1a92ebf | 2146 | @cindex Web |
3f724e9a DL |
2147 | @findex browse-url |
2148 | @findex browse-url-at-point | |
2149 | @findex browse-url-at-mouse | |
3f724e9a DL |
2150 | @cindex Browse-URL |
2151 | @cindex URLs | |
b1a92ebf DL |
2152 | |
2153 | @table @kbd | |
fc98b4ba | 2154 | @item M-x browse-url @key{RET} @var{url} @key{RET} |
b1a92ebf DL |
2155 | Load a URL into a Web browser. |
2156 | @end table | |
2157 | ||
3f724e9a DL |
2158 | The Browse-URL package provides facilities for following URLs specifying |
2159 | links on the World Wide Web. Usually this works by invoking a web | |
df9d7630 RS |
2160 | browser, but you can, for instance, arrange to invoke @code{compose-mail} |
2161 | from @samp{mailto:} URLs. | |
2162 | ||
2163 | The general way to use this feature is to type @kbd{M-x browse-url}, | |
2164 | which displays a specified URL. If point is located near a plausible | |
2165 | URL, that URL is used as the default. Other commands are available | |
2166 | which you might like to bind to keys, such as | |
b1a92ebf | 2167 | @code{browse-url-at-point} and @code{browse-url-at-mouse}. |
3f724e9a | 2168 | |
b1a92ebf | 2169 | @vindex browse-url-browser-function |
39cf6a8d | 2170 | You can customize Browse-URL's behavior via various options in the |
b1a92ebf | 2171 | @code{browse-url} Customize group, particularly |
df9d7630 RS |
2172 | @code{browse-url-browser-function}. You can invoke actions dependent |
2173 | on the type of URL by defining @code{browse-url-browser-function} as | |
2174 | an association list. The package's commentary available via @kbd{C-h | |
6b61353c KH |
2175 | p} under the @samp{hypermedia} keyword provides more information. |
2176 | Packages with facilities for following URLs should always go through | |
2177 | Browse-URL, so that the customization options for Browse-URL will | |
2178 | affect all browsing in Emacs. | |
3f724e9a | 2179 | |
b1a92ebf DL |
2180 | @node Goto-address |
2181 | @subsection Activating URLs | |
3f724e9a DL |
2182 | @findex goto-address |
2183 | @cindex Goto-address | |
2184 | @cindex URLs, activating | |
b1a92ebf DL |
2185 | |
2186 | @table @kbd | |
2187 | @item M-x goto-address | |
2188 | Activate URLs and e-mail addresses in the current buffer. | |
2189 | @end table | |
2190 | ||
df9d7630 RS |
2191 | You can make URLs in the current buffer active with @kbd{M-x |
2192 | goto-address}. This finds all the URLs in the buffer, and establishes | |
2193 | bindings for @kbd{Mouse-2} and @kbd{C-c @key{RET}} on them. After | |
2194 | activation, if you click on a URL with @kbd{Mouse-2}, or move to a URL | |
2195 | and type @kbd{C-c @key{RET}}, that will display the web page that the URL | |
2196 | specifies. For a @samp{mailto} URL, it sends mail instead, using your | |
2197 | selected mail-composition method (@pxref{Mail Methods}). | |
2198 | ||
2199 | It can be useful to add @code{goto-address} to mode hooks and the | |
2200 | hooks used to display an incoming message. | |
2201 | @code{rmail-show-message-hook} is the appropriate hook for Rmail, and | |
2202 | @code{mh-show-mode-hook} for MH-E. This is not needed for Gnus, | |
2203 | which has a similar feature of its own. | |
2204 | ||
3f724e9a | 2205 | |
b1a92ebf DL |
2206 | @node FFAP |
2207 | @subsection Finding Files and URLs at Point | |
3f724e9a DL |
2208 | @findex find-file-at-point |
2209 | @findex ffap | |
b1a92ebf DL |
2210 | @findex ffap-dired-at-point |
2211 | @findex ffap-next | |
2212 | @findex ffap-menu | |
b1a92ebf DL |
2213 | @cindex finding file at point |
2214 | ||
df9d7630 RS |
2215 | FFAP mode replaces certain key bindings for finding files, including |
2216 | @kbd{C-x C-f}, with commands that provide more sensitive defaults. | |
2217 | These commands behave like the ordinary ones when given a prefix | |
2218 | argument. Otherwise, they get the default file name or URL from the | |
2219 | text around point. If what is found in the buffer has the form of a | |
2220 | URL rather than a file name, the commands use @code{browse-url} to | |
2221 | view it. | |
b1a92ebf | 2222 | |
df9d7630 RS |
2223 | This feature is useful for following references in mail or news |
2224 | buffers, @file{README} files, @file{MANIFEST} files, and so on. The | |
6b61353c KH |
2225 | @samp{ffap} package's commentary available via @kbd{C-h p} under the |
2226 | @samp{files} keyword and the @code{ffap} Custom group provide details. | |
b1a92ebf DL |
2227 | |
2228 | @cindex FFAP minor mode | |
2229 | @findex ffap-mode | |
6b61353c KH |
2230 | You can turn on FFAP minor mode by calling @code{ffap-bindings} to |
2231 | make the following key bindings and to install hooks for using | |
2232 | @code{ffap} in Rmail, Gnus and VM article buffers. | |
b1a92ebf DL |
2233 | |
2234 | @table @kbd | |
df9d7630 | 2235 | @item C-x C-f @var{filename} @key{RET} |
b1a92ebf | 2236 | @kindex C-x C-f @r{(FFAP)} |
df9d7630 RS |
2237 | Find @var{filename}, guessing a default from text around point |
2238 | (@code{find-file-at-point}). | |
b1a92ebf DL |
2239 | @item C-x 4 f |
2240 | @kindex C-x 4 f @r{(FFAP)} | |
df9d7630 | 2241 | @code{ffap-other-window}, analogous to @code{find-file-other-window}. |
b1a92ebf DL |
2242 | @item C-x 5 f |
2243 | @kindex C-x 5 f @r{(FFAP)} | |
df9d7630 RS |
2244 | @code{ffap-other-frame}, analogous to @code{find-file-other-frame}. |
2245 | @item M-x ffap-next | |
2246 | Search buffer for next file name or URL, then find that file or URL. | |
2247 | @item C-x d @var{directory} @key{RET} | |
b1a92ebf | 2248 | @kindex C-x d @r{(FFAP)} |
df9d7630 RS |
2249 | Start Dired on @var{directory}, defaulting to the directory name at |
2250 | point (@code{ffap-dired-at-point}). | |
2251 | @item S-Mouse-3 | |
2252 | @kindex S-Mouse-3 @r{(FFAP)} | |
b1a92ebf | 2253 | @code{ffap-at-mouse} finds the file guessed from text around the position |
df9d7630 RS |
2254 | of a mouse click. |
2255 | @item C-S-Mouse-3 | |
2256 | @kindex C-S-Mouse-3 @r{(FFAP)} | |
2257 | Display a menu of files and URLs mentioned in current buffer, then | |
2258 | find the one you select (@code{ffap-menu}). | |
b1a92ebf DL |
2259 | @end table |
2260 | ||
2261 | @node Find-func | |
2262 | @subsection Finding Function and Variable Definitions | |
df9d7630 RS |
2263 | @cindex definitions, finding in Lisp sources |
2264 | @cindex Lisp definitions, finding in sources | |
b1a92ebf DL |
2265 | |
2266 | @table @kbd | |
2267 | @item M-x find-function @key{RET} @var{function} @key{RET} | |
fc98b4ba | 2268 | Find the definition of @var{function} in its source file. |
b1a92ebf | 2269 | @item M-x find-variable @key{RET} @var{variable} @key{RET} |
df9d7630 RS |
2270 | Find the definition of @var{variable} in its source file. |
2271 | @item M-x find-function-on-key @key{RET} @var{key} | |
b1a92ebf DL |
2272 | Find the definition of the function that @var{key} invokes. |
2273 | @end table | |
2274 | ||
df9d7630 RS |
2275 | These commands provide an easy way to find the definitions of Emacs |
2276 | Lisp functions and variables. They are similar in purpose to the Tags | |
2277 | facility (@pxref{Tags}), but don't require a tags table; on the other | |
021037cb | 2278 | hand, they only work for function and variable definitions that are |
df9d7630 RS |
2279 | already loaded in the Emacs session. |
2280 | ||
2281 | @findex find-function | |
2282 | @findex find-function-on-key | |
2283 | @findex find-variable | |
2284 | To find the definition of a function, use @kbd{M-x find-function}. | |
2285 | @kbd{M-x find-variable} finds the definition of a specified variable. | |
2286 | @kbd{M-x find-function-on-key} finds the definition of the function | |
2287 | bound to a specified key. | |
2288 | ||
2289 | To use these commands, you must have the Lisp source (@samp{.el}) | |
2290 | files available along with the compiled (@samp{.elc}) files, in | |
2291 | directories in @code{load-path}. You can use compressed source files | |
2292 | if you enable Auto Compression mode. These commands only handle | |
2293 | definitions written in Lisp, not primitive functions or variables | |
2294 | defined in the C code of Emacs. | |
3f724e9a | 2295 | |
3f724e9a | 2296 | @node Dissociated Press, Amusements, Hyperlinking, Top |
6bf7aab6 DL |
2297 | @section Dissociated Press |
2298 | ||
2299 | @findex dissociated-press | |
2300 | @kbd{M-x dissociated-press} is a command for scrambling a file of text | |
2301 | either word by word or character by character. Starting from a buffer of | |
2302 | straight English, it produces extremely amusing output. The input comes | |
2303 | from the current Emacs buffer. Dissociated Press writes its output in a | |
2304 | buffer named @samp{*Dissociation*}, and redisplays that buffer after every | |
2305 | couple of lines (approximately) so you can read the output as it comes out. | |
2306 | ||
2307 | Dissociated Press asks every so often whether to continue generating | |
2308 | output. Answer @kbd{n} to stop it. You can also stop at any time by | |
2309 | typing @kbd{C-g}. The dissociation output remains in the | |
2310 | @samp{*Dissociation*} buffer for you to copy elsewhere if you wish. | |
2311 | ||
2312 | @cindex presidentagon | |
2313 | Dissociated Press operates by jumping at random from one point in the | |
2314 | buffer to another. In order to produce plausible output rather than | |
2315 | gibberish, it insists on a certain amount of overlap between the end of | |
2316 | one run of consecutive words or characters and the start of the next. | |
6830ceb7 | 2317 | That is, if it has just output `president' and then decides to jump |
6bf7aab6 DL |
2318 | to a different point in the file, it might spot the `ent' in `pentagon' |
2319 | and continue from there, producing `presidentagon'.@footnote{This | |
2320 | dissociword actually appeared during the Vietnam War, when it was very | |
2321 | appropriate.} Long sample texts produce the best results. | |
2322 | ||
2323 | @cindex againformation | |
2324 | A positive argument to @kbd{M-x dissociated-press} tells it to operate | |
2325 | character by character, and specifies the number of overlap characters. A | |
2326 | negative argument tells it to operate word by word and specifies the number | |
2327 | of overlap words. In this mode, whole words are treated as the elements to | |
2328 | be permuted, rather than characters. No argument is equivalent to an | |
2329 | argument of two. For your againformation, the output goes only into the | |
2330 | buffer @samp{*Dissociation*}. The buffer you start with is not changed. | |
2331 | ||
2332 | @cindex Markov chain | |
2333 | @cindex ignoriginal | |
2334 | @cindex techniquitous | |
2335 | Dissociated Press produces nearly the same results as a Markov chain | |
2336 | based on a frequency table constructed from the sample text. It is, | |
2337 | however, an independent, ignoriginal invention. Dissociated Press | |
2338 | techniquitously copies several consecutive characters from the sample | |
2339 | between random choices, whereas a Markov chain would choose randomly for | |
2340 | each word or character. This makes for more plausible sounding results, | |
2341 | and runs faster. | |
2342 | ||
2343 | @cindex outragedy | |
2344 | @cindex buggestion | |
2345 | @cindex properbose | |
2346 | @cindex mustatement | |
2347 | @cindex developediment | |
2348 | @cindex userenced | |
2349 | It is a mustatement that too much use of Dissociated Press can be a | |
2350 | developediment to your real work. Sometimes to the point of outragedy. | |
2351 | And keep dissociwords out of your documentation, if you want it to be well | |
2352 | userenced and properbose. Have fun. Your buggestions are welcome. | |
2353 | ||
2354 | @node Amusements, Customization, Dissociated Press, Top | |
2355 | @section Other Amusements | |
2356 | @cindex boredom | |
2357 | @findex hanoi | |
2358 | @findex yow | |
2359 | @findex gomoku | |
6bf7aab6 DL |
2360 | @cindex tower of Hanoi |
2361 | ||
2362 | If you are a little bit bored, you can try @kbd{M-x hanoi}. If you are | |
ffe4b4e3 | 2363 | considerably bored, give it a numeric argument. If you are very, very |
6bf7aab6 DL |
2364 | bored, try an argument of 9. Sit back and watch. |
2365 | ||
2366 | @cindex Go Moku | |
2367 | If you want a little more personal involvement, try @kbd{M-x gomoku}, | |
2368 | which plays the game Go Moku with you. | |
2369 | ||
2370 | @findex blackbox | |
2371 | @findex mpuz | |
3b65ce47 | 2372 | @findex 5x5 |
6bf7aab6 | 2373 | @cindex puzzles |
3b65ce47 | 2374 | @kbd{M-x blackbox}, @kbd{M-x mpuz} and @kbd{M-x 5x5} are kinds of puzzles. |
6bf7aab6 DL |
2375 | @code{blackbox} challenges you to determine the location of objects |
2376 | inside a box by tomography. @code{mpuz} displays a multiplication | |
2377 | puzzle with letters standing for digits in a code that you must | |
2378 | guess---to guess a value, type a letter and then the digit you think it | |
3b65ce47 | 2379 | stands for. The aim of @code{5x5} is to fill in all the squares. |
6bf7aab6 | 2380 | |
b1a92ebf DL |
2381 | @findex decipher |
2382 | @cindex ciphers | |
2383 | @cindex cryptanalysis | |
2384 | @kbd{M-x decipher} helps you to cryptanalyze a buffer which is encrypted | |
2385 | in a simple monoalphabetic substitution cipher. | |
2386 | ||
6bf7aab6 DL |
2387 | @findex dunnet |
2388 | @kbd{M-x dunnet} runs an adventure-style exploration game, which is | |
2389 | a bigger sort of puzzle. | |
2390 | ||
3b65ce47 DL |
2391 | @findex lm |
2392 | @cindex landmark game | |
2393 | @kbd{M-x lm} runs a relatively non-participatory game in which a robot | |
2394 | attempts to maneuver towards a tree at the center of the window based on | |
2395 | unique olfactory cues from each of the four directions. | |
2396 | ||
2397 | @findex life | |
2398 | @cindex Life | |
2684ed46 | 2399 | @kbd{M-x life} runs Conway's ``Life'' cellular automaton. |
3b65ce47 | 2400 | |
b1a92ebf DL |
2401 | @findex morse-region |
2402 | @findex unmorse-region | |
2403 | @cindex Morse code | |
2404 | @cindex --/---/.-./.../. | |
2405 | @kbd{M-x morse-region} converts text in a region to Morse code and | |
2406 | @kbd{M-x unmorse-region} converts it back. No cause for remorse. | |
2407 | ||
2408 | @findex pong | |
2409 | @cindex Pong game | |
df9d7630 RS |
2410 | @kbd{M-x pong} plays a Pong-like game, bouncing the ball off opposing |
2411 | bats. | |
b1a92ebf | 2412 | |
3b65ce47 DL |
2413 | @findex solitaire |
2414 | @cindex solitaire | |
2415 | @kbd{M-x solitaire} plays a game of solitaire in which you jump pegs | |
2416 | across other pegs. | |
2417 | ||
b1a92ebf DL |
2418 | @findex studlify-region |
2419 | @cindex StudlyCaps | |
df9d7630 RS |
2420 | @kbd{M-x studlify-region} studlify-cases the region, producing |
2421 | text like this: | |
b1a92ebf DL |
2422 | |
2423 | @example | |
2424 | M-x stUdlIfY-RegioN stUdlIfY-CaSeS thE region. | |
2425 | @end example | |
2426 | ||
3b65ce47 DL |
2427 | @findex tetris |
2428 | @cindex Tetris | |
3b65ce47 DL |
2429 | @findex snake |
2430 | @cindex Snake | |
df9d7630 | 2431 | @kbd{M-x tetris} runs an implementation of the well-known Tetris game. |
3b65ce47 DL |
2432 | Likewise, @kbd{M-x snake} provides an implementation of Snake. |
2433 | ||
6bf7aab6 DL |
2434 | When you are frustrated, try the famous Eliza program. Just do |
2435 | @kbd{M-x doctor}. End each input by typing @key{RET} twice. | |
2436 | ||
2437 | @cindex Zippy | |
2438 | When you are feeling strange, type @kbd{M-x yow}. | |
834d56ed DL |
2439 | |
2440 | @findex zone | |
2441 | The command @kbd{M-x zone} plays games with the display when Emacs is | |
2442 | idle. | |
6b61353c KH |
2443 | |
2444 | @ignore | |
2445 | arch-tag: 8f094220-c0d5-4e9e-af7d-3e0da8187474 | |
2446 | @end ignore |