[bpt/emacs.git] / man / cmdargs.texi

@c This is part of the Emacs manual.
@c Copyright (C) 1985,86,87,93,94,95,1997,2001 Free Software Foundation, Inc.
@c See file emacs.texi for copying conditions.
@node Command Arguments, X Resources, Service, Top
@appendix Command Line Arguments
@cindex command line arguments
@cindex arguments (command line)
@cindex options (command line)
@cindex switches (command line)
@cindex startup (command line arguments)

  GNU Emacs supports command line arguments to request various actions
when invoking Emacs.  These are for compatibility with other editors and
for sophisticated activities.  We don't recommend using them for
ordinary editing.

  Arguments starting with @samp{-} are @dfn{options}.  Other arguments
specify files to visit.  Emacs visits the specified files while it
starts up.  The last file name on your command line becomes the
current buffer; the other files are also visited in other buffers.  If
there are two files, they are both displayed; otherwise the last file
is displayed along with a buffer list that shows what other buffers
there are.  As with most programs, the special argument @samp{--} says
that all subsequent arguments are file names, not options, even if
they start with @samp{-}.

  Emacs command options can specify many things, such as the size and
position of the X window Emacs uses, its colors, and so on.  A few
options support advanced usage, such as running Lisp functions on files
in batch mode.  The sections of this chapter describe the available
options, arranged according to their purpose.

  There are two ways of writing options: the short forms that start with
a single @samp{-}, and the long forms that start with @samp{--}.  For
example, @samp{-d} is a short form and @samp{--display} is the
corresponding long form.

  The long forms with @samp{--} are easier to remember, but longer to
type.  However, you don't have to spell out the whole option name; any
unambiguous abbreviation is enough.  When a long option takes an
argument, you can use either a space or an equal sign to separate the
option name and the argument.  Thus, you can write either
@samp{--display sugar-bombs:0.0} or @samp{--display=sugar-bombs:0.0}.
We recommend an equal sign because it makes the relationship clearer,
and the tables below always show an equal sign.

@cindex initial options (command line)
@cindex action options (command line)
  Most options specify how to initialize Emacs, or set parameters for
the Emacs session.  We call them @dfn{initial options}.  A few options
specify things to do: for example, load libraries, call functions, or
terminate Emacs.  These are called @dfn{action options}.  These and file
names together are called @dfn{action arguments}.  Emacs processes all
the action arguments in the order they are written.

@menu
* Action Arguments::	Arguments to visit files, load libraries,
			  and call functions.
* Initial Options::     Arguments that take effect while starting Emacs.
* Command Example::     Examples of using command line arguments.
* Resume Arguments::	Specifying arguments when you resume a running Emacs.
* Environment::         Environment variables that Emacs uses.

* Display X::           Changing the default display and using remote login.
* Font X::	        Choosing a font for text, under X.
* Colors X::	        Choosing colors, under X.
* Window Size X::       Start-up window size, under X.
* Borders X::	        Internal and external borders, under X.
* Title X::             Specifying the initial frame's title.
* Icons X::             Choosing what sort of icon to use, under X.
* Resources X::         Advanced use of classes and resources, under X.
* Lucid Resources::     X resources for Lucid menus.
* LessTif Resources::   X resources for LessTif and Motif menus.
@end menu

@node Action Arguments
@appendixsec Action Arguments

  Here is a table of the action arguments and options:

@table @samp
@item @var{file}
@opindex --visit
@itemx --visit=@var{file}
@opindex --file
@itemx --file=@var{file}
@cindex visiting files, command-line argument
Visit @var{file} using @code{find-file}.  @xref{Visiting}.

@item +@var{linenum} @var{file}
@opindex +@var{linenum}
Visit @var{file} using @code{find-file}, then go to line number
@var{linenum} in it.

@item +@var{linenum}:@var{columnnum} @var{file}
Visit @var{file} using @code{find-file}, then go to line number
@var{linenum} and put point at column number @var{columnnum}.

@need 3000
@item -l @var{file}
@opindex -l
@itemx --load=@var{file}
@opindex --load
@cindex loading Lisp libraries, command-line argument
Load a Lisp library named @var{file} with the function @code{load}.
@xref{Lisp Libraries}.  The library can be found either in the current
directory, or in the Emacs library search path as specified
with @env{EMACSLOADPATH} (@pxref{General Variables}).

@item -f @var{function}
@opindex -f
@itemx --funcall=@var{function}
@opindex --funcall
@cindex call Lisp functions, command-line argument
Call Lisp function @var{function} with no arguments.

@item --eval=@var{expression}
@opindex --eval
@itemx --execute=@var{expression}
@opindex --execute
@cindex evaluate expression, command-line argument
Evaluate Lisp expression @var{expression}.

@item --insert=@var{file}
@opindex --insert
@cindex insert file contents, command-line argument
Insert the contents of @var{file} into the current buffer.  This is like
what @kbd{M-x insert-file} does.  @xref{Misc File Ops}.

@item --kill
@opindex --kill
Exit from Emacs without asking for confirmation.
@end table

@vindex command-line-args
  The init file can access the values of the action arguments as the
elements of a list in the variable @code{command-line-args}.  The init
file can override the normal processing of the action arguments, or
define new ones, by reading and setting this variable.

@node Initial Options
@appendixsec Initial Options

  The initial options specify parameters for the Emacs session.  This
section describes the more general initial options; some other options
specifically related to the X Window System appear in the following
sections.

  Some initial options affect the loading of init files.  The normal
actions of Emacs are to first load @file{site-start.el} if it exists,
then your own init file @file{~/.emacs} if it exists, and finally
@file{default.el} if it exists; certain options prevent loading of some
of these files or substitute other files for them.

@table @samp
@item -t @var{device}
@opindex -t
@itemx --terminal=@var{device}
@opindex --terminal
@cindex device for Emacs terminal I/O
Use @var{device} as the device for terminal input and output.

@item -d @var{display}
@opindex -d
@itemx --display=@var{display}
@opindex --display
@cindex display for Emacs frame
Use the X Window System and use the display named @var{display} to open
the initial Emacs frame.  @xref{Display X}, for more details.

@item -nw
@opindex -nw
@itemx --no-windows
@opindex --no-windows
@cindex disable window system
Don't communicate directly with the window system, disregarding the
@env{DISPLAY} environment variable even if it is set.  This forces Emacs
to run as if the display were a text-only terminal.

@need 3000
@cindex batch mode
@item -batch
@opindex --batch
@itemx --batch
Run Emacs in @dfn{batch mode}, which means that the text being edited is
not displayed and the standard terminal interrupt characters such as
@kbd{C-z} and @kbd{C-c} continue to have their normal effect.  Emacs in
batch mode outputs to @code{stderr} only what would normally be displayed
in the echo area under program control, and functions which would
normally read from the minibuffer take their input from @code{stdin}.

Batch mode is used for running programs written in Emacs Lisp from
shell scripts, makefiles, and so on.  Normally the @samp{-l} option
or @samp{-f} option will be used as well, to invoke a Lisp program
to do the batch processing.

@samp{-batch} implies @samp{-q} (do not load an init file).  It also
causes Emacs to exit after processing all the command options.  In
addition, it disables auto-saving except in buffers for which it has
been explicitly requested.

@item -q
@opindex -q
@itemx --no-init-file
@opindex --no-init-file
@cindex bypassing init and site-start file
@cindex init file, not loading
@cindex @file{default.el} file, not loading
Do not load your Emacs init file @file{~/.emacs}, or @file{default.el}
either.  When invoked like this, Emacs does not allow saving options
changed with the @kbd{M-x customize} command and its variants.
@xref{Easy Customization}.

@item --no-site-file
@opindex --no-site-file
@cindex @file{site-start.el} file, not loading
Do not load @file{site-start.el}.  The options @samp{-q}, @samp{-u}
and @samp{-batch} have no effect on the loading of this file---this is
the only option that blocks it.

@item -u @var{user}
@opindex -u
@itemx --user=@var{user}
@opindex --user
@cindex load init file of another user
Load @var{user}'s Emacs init file @file{~@var{user}/.emacs} instead of
your own.

@item --debug-init
@opindex --debug-init
@cindex errors in init file
Enable the Emacs Lisp debugger for errors in the init file.

@item --unibyte
@opindex --unibyte
@cindex unibyte operation, command-line argument
Do almost everything with single-byte buffers and strings.
All buffers and strings are unibyte unless you (or a Lisp program)
explicitly ask for a multibyte buffer or string.  (Note that Emacs
always loads Lisp files in multibyte mode, even if @samp{--unibyte} is
specified; see @ref{Enabling Multibyte}.)  Setting the environment
variable @env{EMACS_UNIBYTE} has the same effect.

@item --multibyte
@opindex --multibyte
Inhibit the effect of @env{EMACS_UNIBYTE}, so that Emacs
uses multibyte characters by default, as usual.
@end table

@node Command Example
@appendixsec Command Argument Example

  Here is an example of using Emacs with arguments and options.  It
assumes you have a Lisp program file called @file{hack-c.el} which, when
loaded, performs some useful operation on the current buffer, expected
to be a C program.

@example
emacs -batch foo.c -l hack-c -f save-buffer >& log
@end example

@noindent
This says to visit @file{foo.c}, load @file{hack-c.el} (which makes
changes in the visited file), save @file{foo.c} (note that
@code{save-buffer} is the function that @kbd{C-x C-s} is bound to), and
then exit back to the shell (because of @samp{-batch}).  @samp{-batch}
also guarantees there will be no problem redirecting output to
@file{log}, because Emacs will not assume that it has a display terminal
to work with.

@node Resume Arguments
@appendixsec Resuming Emacs with Arguments

  You can specify action arguments for Emacs when you resume it after
a suspension.  To prepare for this, put the following code in your
@file{.emacs} file (@pxref{Hooks}):

@c `resume-suspend-hook' is correct.  It is the name of a function.
@example
(add-hook 'suspend-hook 'resume-suspend-hook)
(add-hook 'suspend-resume-hook 'resume-process-args)
@end example

  As further preparation, you must execute the shell script
@file{emacs.csh} (if you use csh as your shell) or @file{emacs.bash}
(if you use bash as your shell).  These scripts define an alias named
@code{edit}, which will resume Emacs giving it new command line
arguments such as files to visit.  The scripts are found in the
@file{etc} subdirectory of the Emacs distribution.

  Only action arguments work properly when you resume Emacs.  Initial
arguments are not recognized---it's too late to execute them anyway.

  Note that resuming Emacs (with or without arguments) must be done from
within the shell that is the parent of the Emacs job.  This is why
@code{edit} is an alias rather than a program or a shell script.  It is
not possible to implement a resumption command that could be run from
other subjobs of the shell; there is no way to define a command that could
be made the value of @env{EDITOR}, for example.  Therefore, this feature
does not take the place of the Emacs Server feature (@pxref{Emacs
Server}).

  The aliases use the Emacs Server feature if you appear to have a
server Emacs running.  However, they cannot determine this with complete
accuracy.  They may think that a server is still running when in
actuality you have killed that Emacs, because the file
@file{/tmp/esrv@dots{}} still exists.  If this happens, find that
file and delete it.

@node Environment
@appendixsec Environment Variables
@cindex environment variables

  The @dfn{environment} is a feature of the operating system; it
consists of a collection of variables with names and values.  Each
variable is called an @dfn{environment variable}; environment variable
names are case-sensitive, and it is conventional to use upper case
letters only.  The values are all text strings.

  What makes the environment useful is that subprocesses inherit the
environment automatically from their parent process.  This means you
can set up an environment variable in your login shell, and all the
programs you run (including Emacs) will automatically see it.
Subprocesses of Emacs (such as shells, compilers, and version-control
software) inherit the environment from Emacs, too.

@findex setenv
@findex getenv
  Inside Emacs, the command @kbd{M-x getenv} gets the value of an
environment variable.  @kbd{M-x setenv} sets a variable in the Emacs
environment.  The way to set environment variables outside of Emacs
depends on the operating system, and especially the shell that you are
using.  For example, here's how to set the environment variable
@env{ORGANIZATION} to @samp{not very much} using Bash:

@example
export ORGANIZATION="not very much"
@end example

@noindent
and here's how to do it in csh or tcsh:

@example
setenv ORGANIZATION "not very much"
@end example

  When Emacs is uses the X Window System, it inherits the use
of a large number of environment variables from the X libraries.  See
the X documentation for more information.

@menu
* General Variables::   Environment variables that all versions of Emacs use.
* Misc Variables::      Certain system-specific variables.
@end menu

@node General Variables
@appendixsubsec General Variables

  Here is an alphabetical list of specific environment variables that
have special meanings in Emacs, giving the name of each variable and
its meaning.  Most of these variables are also used by some other
programs.  Emacs does not require any of these environment variables
to be set, but it uses their values if they are set.

@table @env
@item CDPATH
Used by the @code{cd} command to search for the directory you specify,
when you specify a relative directory name.
@item EMACS_UNIBYTE
@cindex unibyte operation, environment variable
Defining this environment variable with a nonempty value directs Emacs
to do almost everything with single-byte buffers and strings.  It is
equivalent to using the @samp{--unibyte} command-line option on each
invocation.  @xref{Initial Options}.
@item EMACSDATA
Directory for the architecture-independent files that come with Emacs.
This is used to initialize the Lisp variable @code{data-directory}.
@item EMACSDOC
Directory for the documentation string file,
@file{DOC-@var{emacsversion}}.  This is used to initialize the Lisp
variable @code{doc-directory}.
@item EMACSLOADPATH
A colon-separated list of directories@footnote{
Here and below, whenever we say ``colon-separated list of directories'',
it pertains to Unix and GNU/Linux systems.  On MS-DOS and MS-Windows,
the directories are separated by semi-colons instead, since DOS/Windows
file names might include a colon after a drive letter.}
to search for Emacs Lisp files---used to initialize @code{load-path}.
@item EMACSPATH
A colon-separated list of directories to search for executable
files---used to initialize @code{exec-path}.
@item ESHELL
Used for shell-mode to override the @env{SHELL} environment variable.
@item HISTFILE
The name of the file that shell commands are saved in between logins.
This variable defaults to @file{~/.bash_history} if you use Bash, to
@file{~/.sh_history} if you use ksh, and to @file{~/.history}
otherwise.
@item HOME
The location of the user's files in the directory tree; used for
expansion of file names starting with a tilde (@file{~}).  On MS-DOS, it
defaults to the directory from which Emacs was started, with @samp{/bin}
removed from the end if it was present.  On Windows, the default value
of @code{HOME} is @file{C:/}, the root directory of drive @file{C:}.
@item HOSTNAME
The name of the machine that Emacs is running on.
@item INCPATH 
A colon-separated list of directories.  Used by the @code{complete} package
to search for files.
@item INFOPATH
A colon-separated list of directories in which to search for Info files.
@item LC_ALL
@itemx LC_COLLATE
@itemx LC_CTYPE
@itemx LC_MESSAGES
@itemx LC_MONETARY
@itemx LC_NUMERIC
@itemx LC_TIME
@itemx LANG
The user's preferred locale.  The locale has six categories, specified
by the environment variables @env{LC_COLLATE} for sorting,
@env{LC_CTYPE} for character encoding, @env{LC_MESSAGES} for system
messages, @env{LC_MONETARY} for monetary formats, @env{LC_NUMERIC} for
numbers, and @env{LC_TIME} for dates and times.  If one of these
variables is not set, the category defaults to the value of the
@env{LANG} environment variable, or to the default @samp{C} locale if
@env{LANG} is not set.  But if @env{LC_ALL} is specified, it overrides
the settings of all the other locale environment variables.

The value of the LC_CTYPE category is
matched against entries in @code{locale-language-names},
@code{locale-charset-language-names}, and
@code{locale-preferred-coding-systems}, to select a default language
environment and coding system.  @xref{Language Environments}.
@item LOGNAME
The user's login name.  See also @env{USER}.
@item MAIL
The name of the user's system mail inbox.
@item MAILRC
Name of file containing mail aliases.  (The default is
@file{~/.mailrc}.)
@item MH
Name of setup file for the mh system.  (The default is @file{~/.mh_profile}.)
@item NAME
The real-world name of the user.
@item NNTPSERVER
The name of the news server.  Used by the mh and Gnus packages.
@item ORGANIZATION
The name of the organization to which you belong.  Used for setting the
`Organization:' header in your posts from the Gnus package.
@item PATH
A colon-separated list of directories in which executables reside.  This
is used to initialize the Emacs Lisp variable @code{exec-path}.
@item PWD
If set, this should be the default directory when Emacs was started.
@item REPLYTO
If set, this specifies an initial value for the variable
@code{mail-default-reply-to}.  @xref{Mail Headers}.
@item SAVEDIR
The name of a directory in which news articles are saved by default.
Used by the Gnus package.
@item SHELL
The name of an interpreter used to parse and execute programs run from
inside Emacs.
@cindex background mode, on @code{xterm}
@item TERM
The type of the terminal that Emacs is using.  This variable must be
set unless Emacs is run in batch mode.  On MS-DOS, it defaults to
@samp{internal}, which specifies a built-in terminal emulation that
handles the machine's own display.  If the value of @env{TERM} indicates
that Emacs runs in non-windowed mode from @code{xterm} or a similar
terminal emulator, the background mode defaults to @samp{light}, and
Emacs will choose colors that are appropriate for a light background.
@item TERMCAP
The name of the termcap library file describing how to program the
terminal specified by the @env{TERM} variable.  This defaults to
@file{/etc/termcap}.
@item TMPDIR
Used by the Emerge package as a prefix for temporary files.
@item TZ
This specifies the current time zone and possibly also daylight
saving time information.  On MS-DOS, if @code{TZ} is not set in the
environment when Emacs starts, Emacs defines a default value as
appropriate for the country code returned by DOS.  On MS-Windows, Emacs
does not use @code{TZ} at all.
@item USER
The user's login name.  See also @env{LOGNAME}.  On MS-DOS, this
defaults to @samp{root}.
@item VERSION_CONTROL
Used to initialize the @code{version-control} variable (@pxref{Backup
Names}).
@end table

@node Misc Variables
@appendixsubsec Miscellaneous Variables

These variables are used only on particular configurations:

@table @env
@item COMSPEC
On MS-DOS and MS-Windows, the name of the command interpreter to use
when invoking batch files and commands internal to the shell.  On MS-DOS
this is also used to make a default value for the @env{SHELL} environment
variable.

@item NAME
On MS-DOS, this variable defaults to the value of the @env{USER}
variable.

@item TEMP
@itemx TMP
On MS-DOS and MS-Windows, these specify the name of the directory for
storing temporary files in.

@item EMACSTEST
On MS-DOS, this specifies a file to use to log the operation of the
internal terminal emulator.  This feature is useful for submitting bug
reports.

@item EMACSCOLORS
On MS-DOS, this specifies the screen colors.  It is useful to set them
this way, since otherwise Emacs would display the default colors
momentarily when it starts up.

The value of this variable should be the two-character encoding of the
foreground (the first character) and the background (the second
character) colors of the default face.  Each character should be the
hexadecimal code for the desired color on a standard PC text-mode
display.  For example, to get blue text on a light gray background,
specify @samp{EMACSCOLORS=17}, since 1 is the code of the blue color and
7 is the code of the light gray color.

The PC display usually supports only eight background colors.  However,
Emacs switches the DOS display to a mode where all 16 colors can be used
for the background, so all four bits of the background color are
actually used.

@item WINDOW_GFX
Used when initializing the Sun windows system.
@end table

@node X Resources, Antinews, Command Arguments, Top
@appendix X Resources

  Some aspects of Emacs behavior can be customized using X resources,
as with other programs that use X.  A few things, relating to toolkit
menus and tooltip windows, can only be customized this way, since they
are handled by libraries that are already set up to get their
customizations thus.

@node Display X
@appendixsec Specifying the Display Name 
@cindex display name (X Window System)
@cindex @env{DISPLAY} environment variable

  The environment variable @env{DISPLAY} tells all X clients, including
Emacs, where to display their windows.  Its value is set by default
in ordinary circumstances, when you start an X server and run jobs
locally.  Occasionally you may need to specify the display yourself; for
example, if you do a remote login and want to run a client program
remotely, displaying on your local screen.

  With Emacs, the main reason people change the default display is to
let them log into another system, run Emacs on that system, but have the
window displayed at their local terminal.  You might need to log in
to another system because the files you want to edit are there, or
because the Emacs executable file you want to run is there.

  The syntax of the @env{DISPLAY} environment variable is
@samp{@var{host}:@var{display}.@var{screen}}, where @var{host} is the
host name of the X Window System server machine, @var{display} is an
arbitrarily-assigned number that distinguishes your server (X terminal)
from other servers on the same machine, and @var{screen} is a
rarely-used field that allows an X server to control multiple terminal
screens.  The period and the @var{screen} field are optional.  If
included, @var{screen} is usually zero.

  For example, if your host is named @samp{glasperle} and your server is
the first (or perhaps the only) server listed in the configuration, your
@env{DISPLAY} is @samp{glasperle:0.0}.

  You can specify the display name explicitly when you run Emacs, either
by changing the @env{DISPLAY} variable, or with the option @samp{-d
@var{display}} or @samp{--display=@var{display}}.  Here is an example:

@smallexample
emacs --display=glasperle:0 &
@end smallexample

  You can inhibit the direct use of the window system and GUI with the
@samp{-nw} option.  It tells Emacs to display using ordinary ASCII on
its controlling terminal.  This is also an initial option.

  Sometimes, security arrangements prevent a program on a remote system
from displaying on your local system.  In this case, trying to run Emacs
produces messages like this:

@smallexample
Xlib:  connection to "glasperle:0.0" refused by server
@end smallexample

@noindent
You might be able to overcome this problem by using the @code{xhost}
command on the local system to give permission for access from your
remote machine.

@node Font X
@appendixsec Font Specification Options
@cindex font name (X Window System)

  By default, Emacs displays text in the font named @samp{9x15}, which
makes each character nine pixels wide and fifteen pixels high.  You can
specify a different font on your command line through the option
@samp{-fn @var{name}} (or @samp{--font}, which is an alias for
@samp{-fn}).

@table @samp
@item -fn @var{name}
@opindex -fn
@itemx --font=@var{name}
@opindex --font
@cindex specify default font from the command line
Use font @var{name} as the default font.
@end table

  Under X, each font has a long name which consists of eleven words or
numbers, separated by dashes.  Some fonts also have shorter
nicknames---@samp{9x15} is such a nickname.  You can use either kind of
name.  You can use wildcard patterns for the font name; then Emacs lets
X choose one of the fonts that match the pattern.  Here is an example,
which happens to specify the font whose nickname is @samp{6x13}:

@smallexample
emacs -fn "-misc-fixed-medium-r-semicondensed--13-*-*-*-c-60-iso8859-1" &
@end smallexample

@noindent
You can also specify the font in your @file{.Xdefaults} file:

@smallexample
emacs.font: -misc-fixed-medium-r-semicondensed--13-*-*-*-c-60-iso8859-1
@end smallexample

  A long font name has the following form:

@smallexample
-@var{maker}-@var{family}-@var{weight}-@var{slant}-@var{widthtype}-@var{style}@dots{}
@dots{}-@var{pixels}-@var{height}-@var{horiz}-@var{vert}-@var{spacing}-@var{width}-@var{charset}
@end smallexample

@table @var
@item maker
This is the name of the font manufacturer.
@item family
This is the name of the font family---for example, @samp{courier}.
@item weight
This is normally @samp{bold}, @samp{medium} or @samp{light}.  Other
words may appear here in some font names.
@item slant
This is @samp{r} (roman), @samp{i} (italic), @samp{o} (oblique),
@samp{ri} (reverse italic), or @samp{ot} (other).
@item widthtype
This is normally @samp{condensed}, @samp{extended}, @samp{semicondensed}
or @samp{normal}.  Other words may appear here in some font names.
@item style
This is an optional additional style name.  Usually it is empty---most
long font names have two hyphens in a row at this point.
@item pixels
This is the font height, in pixels.
@item height
This is the font height on the screen, measured in tenths of a printer's
point---approximately 1/720 of an inch.  In other words, it is the point
size of the font, times ten.  For a given vertical resolution,
@var{height} and @var{pixels} are proportional; therefore, it is common
to specify just one of them and use @samp{*} for the other.
@item horiz
This is the horizontal resolution, in pixels per inch, of the screen for
which the font is intended.
@item vert
This is the vertical resolution, in pixels per inch, of the screen for
which the font is intended.  Normally the resolution of the fonts on
your system is the right value for your screen; therefore, you normally
specify @samp{*} for this and @var{horiz}.
@item spacing
This is @samp{m} (monospace), @samp{p} (proportional) or @samp{c}
(character cell).
@item width
This is the average character width, in pixels, multiplied by ten.
@item charset
This is the character set that the font depicts.
Normally you should use @samp{iso8859-1}.
@end table

@cindex listing system fonts
  You will probably want to use a fixed-width default font---that is,
a font in which all characters have the same width.  Any font with
@samp{m} or @samp{c} in the @var{spacing} field of the long name is a
fixed-width font.  Here's how to use the @code{xlsfonts} program to
list all the fixed-width fonts available on your system:

@example
xlsfonts -fn '*x*' | egrep "^[0-9]+x[0-9]+"
xlsfonts -fn '*-*-*-*-*-*-*-*-*-*-*-m*'
xlsfonts -fn '*-*-*-*-*-*-*-*-*-*-*-c*'
@end example

@noindent
To see what a particular font looks like, use the @code{xfd} command.
For example:

@example
xfd -fn 6x13
@end example

@noindent
displays the entire font @samp{6x13}.

  While running Emacs, you can set the font of the current frame
(@pxref{Frame Parameters}) or for a specific kind of text
(@pxref{Faces}).

@node Colors X
@appendixsec Window Color Options
@cindex color of window
@cindex text colors, from command line

@findex list-colors-display
@cindex available colors
  On a color display, you can specify which color to use for various
parts of the Emacs display.  To find out what colors are available on
your system, type @kbd{M-x list-colors-display}, or press
@kbd{C-Mouse-2} and select @samp{Display Colors} from the pop-up menu.
If you do not specify colors, on windowed displays the default for the
background is white and the default for all other colors is black.  On a
monochrome display, the foreground is black, the background is white,
and the border is gray if the display supports that.  On terminals, the
background is usually black and the foreground is white.

  Here is a list of the command-line options for specifying colors:

@table @samp
@item -fg @var{color}
@opindex -fg
@itemx --foreground-color=@var{color}
@opindex --foreground-color
@cindex foreground color, command-line argument
Specify the foreground color.  @var{color} should be a standard color
name, or a numeric specification of the color's red, green, and blue
components as in @samp{#4682B4} or @samp{RGB:46/82/B4}.
@item -bg @var{color}
@opindex -bg
@itemx --background-color=@var{color}
@opindex --background-color
@cindex background color, command-line argument
Specify the background color.
@item -bd @var{color}
@opindex -bd
@itemx --border-color=@var{color}
@opindex --border-color
@cindex border color, command-line argument
Specify the color of the border of the X window.
@item -cr @var{color}
@opindex -cr
@itemx --cursor-color=@var{color}
@opindex --cursor-color
@cindex cursor color, command-line argument
Specify the color of the Emacs cursor which indicates where point is.
@item -ms @var{color}
@opindex -ms
@itemx --mouse-color=@var{color}
@opindex --mouse-color
@cindex mouse pointer color, command-line argument
Specify the color for the mouse cursor when the mouse is in the Emacs window.
@item -r
@opindex -r
@itemx -rv
@opindex -rv
@itemx --reverse-video
@opindex --reverse-video
@cindex reverse video, command-line argument
Reverse video---swap the foreground and background colors.
@end table

  For example, to use a coral mouse cursor and a slate blue text cursor,
enter:

@example
emacs -ms coral -cr 'slate blue' &
@end example

  You can reverse the foreground and background colors through the
@samp{-rv} option or with the X resource @samp{reverseVideo}.

  The @samp{-fg}, @samp{-bg}, and @samp{-rv} options function on
text-only terminals as well as on window systems.

@node Window Size X
@appendixsec Options for Window Geometry
@cindex geometry of Emacs window
@cindex position and size of Emacs frame
@cindex width and height of Emacs frame

  The @samp{--geometry} option controls the size and position of the
initial Emacs frame.  Here is the format for specifying the window
geometry:

@table @samp
@item -g @var{width}x@var{height}@r{[@{}+-@r{@}}@var{xoffset}@r{@{}+-@r{@}}@var{yoffset}@r{]]}
@opindex -g
Specify window size @var{width} and @var{height} (measured in character
columns and lines), and positions @var{xoffset} and @var{yoffset}
(measured in pixels).

@item --geometry=@var{width}x@var{height}@r{[@{}+-@r{@}}@var{xoffset}@r{@{}+-@r{@}}@var{yoffset}@r{]]}
@opindex --geometry
This is another way of writing the same thing.
@end table

@noindent
@code{@r{@{}+-@r{@}}} means either a plus sign or a minus sign.  A plus
sign before @var{xoffset} means it is the distance from the left side of
the screen; a minus sign means it counts from the right side.  A plus
sign before @var{yoffset} means it is the distance from the top of the
screen, and a minus sign there indicates the distance from the bottom.
The values @var{xoffset} and @var{yoffset} may themselves be positive or
negative, but that doesn't change their meaning, only their direction.

  Emacs uses the same units as @code{xterm} does to interpret the geometry.
The @var{width} and @var{height} are measured in characters, so a large font
creates a larger frame than a small font.  (If you specify a proportional
font, Emacs uses its maximum bounds width as the width unit.)  The
@var{xoffset} and @var{yoffset} are measured in pixels.

  Since the mode line and the echo area occupy the last 2 lines of the
frame, the height of the initial text window is 2 less than the height
specified in your geometry.  In non-X-toolkit versions of Emacs, the
menu bar also takes one line of the specified number.  But in the X
toolkit version, the menu bar is additional and does not count against
the specified height.  The tool bar, if present, is also additional.

  You do not have to specify all of the fields in the geometry
specification.

  If you omit both @var{xoffset} and @var{yoffset}, the window manager
decides where to put the Emacs frame, possibly by letting you place
it with the mouse.  For example, @samp{164x55} specifies a window 164
columns wide, enough for two ordinary width windows side by side, and 55
lines tall.

  The default width for Emacs is 80 characters and the default height is
40 lines.  You can omit either the width or the height or both.  If
you start the geometry with an integer, Emacs interprets it as the
width.  If you start with an @samp{x} followed by an integer, Emacs
interprets it as the height.  Thus, @samp{81} specifies just the width;
@samp{x45} specifies just the height.

  If you start with @samp{+} or @samp{-}, that introduces an offset,
which means both sizes are omitted.  Thus, @samp{-3} specifies the
@var{xoffset} only.  (If you give just one offset, it is always
@var{xoffset}.)  @samp{+3-3} specifies both the @var{xoffset} and the
@var{yoffset}, placing the frame near the bottom left of the screen.

  You can specify a default for any or all of the fields in
@file{.Xdefaults} file, and then override selected fields with a
@samp{--geometry} option.

@node Borders X
@appendixsec Internal and External Borders
@cindex borders (X Window System)

  An Emacs frame has an internal border and an external border.  The
internal border is an extra strip of the background color around the
text portion of the frame.  Emacs itself draws the internal border.
The external border is added by the window manager outside the frame;
depending on the window manager you use, it may contain various boxes
you can click on to move or iconify the window.

@table @samp
@item -ib @var{width}
@opindex -ib
@itemx --internal-border=@var{width}
@opindex --internal-border
@cindex border width, command-line argument
Specify @var{width} as the width of the internal border, in pixels.

@item -bw @var{width}
@opindex -bw
@itemx --border-width=@var{width}
@opindex --border-width
Specify @var{width} as the width of the main border, in pixels.
@end table

  When you specify the size of the frame, that does not count the
borders.  The frame's position is measured from the outside edge of the
external border.

  Use the @samp{-ib @var{n}} option to specify an internal border
@var{n} pixels wide.  The default is 1.  Use @samp{-bw @var{n}} to
specify the width of the external border (though the window manager may
not pay attention to what you specify).  The default width of the
external border is 2.

@node Title X
@appendixsec Frame Titles

  An Emacs frame may or may not have a specified title.  The frame
title, if specified, appears in window decorations and icons as the
name of the frame.  If an Emacs frame has no specified title, the
default title has the form @samp{@var{invocation-name}@@@var{machine}}
(if there is only one frame) or the selected window's buffer name (if
there is more than one frame).

  You can specify a title for the initial Emacs frame with a command
line option:

@table @samp
@item -title @var{title}
@opindex --title
@itemx --title=@var{title}
@itemx -T @var{title}
@opindex -T
@cindex frame title, command-line argument
Specify @var{title} as the title for the initial Emacs frame.
@end table

  The @samp{--name} option (@pxref{Resources X}) also specifies the title
for the initial Emacs frame.

@node Icons X
@appendixsec Icons
@cindex icons (X Window System)

  Most window managers allow the user to ``iconify'' a frame, removing
it from sight, and leaving a small, distinctive ``icon'' window in its
place.  Clicking on the icon window makes the frame itself appear again.
If you have many clients running at once, you can avoid cluttering up
the screen by iconifying most of the clients.

@table @samp
@item -i
@opindex -i
@itemx --icon-type
@opindex --icon-type
@cindex Emacs icon, a gnu
Use a picture of a gnu as the Emacs icon.

@item -iconic
@opindex --iconic
@itemx --iconic
@cindex start iconified, command-line argument
Start Emacs in iconified state.
@end table

  The @samp{-i} or @samp{--icon-type} option tells Emacs to use an icon
window containing a picture of the GNU gnu.  If omitted, Emacs lets the
window manager choose what sort of icon to use---usually just a small
rectangle containing the frame's title.

  The @samp{-iconic} option tells Emacs to begin running as an icon,
rather than showing a frame right away.  In this situation, the icon
is the only indication that Emacs has started; the text frame doesn't
appear until you deiconify it.

@node Resources X
@appendixsec X Resources
@cindex resources

@cindex X resources, @file{~/.Xdefaults} file
  Programs running under the X Window System organize their user options
under a hierarchy of classes and resources.  You can specify default
values for these options in your X resources file, usually named
@file{~/.Xdefaults}.

  Each line in the file specifies a value for one option or for a
collection of related options, for one program or for several programs
(optionally even for all programs).

@cindex Registry (MS-Windows)
@cindex @file{.Xdefaults} file, and MS-Windows
  MS-Windows systems don't support @file{~/.Xdefaults} files, but
Emacs compiled for Windows looks for X resources in the Windows
Registry, under the keys @samp{HKEY_CURRENT_USER\SOFTWARE\GNU\Emacs}
and @samp{HKEY_LOCAL_MACHINE\SOFTWARE\GNU\Emacs}.

  Programs define named resources with particular meanings.  They also
define how to group resources into named classes.  For instance, in
Emacs, the @samp{internalBorder} resource controls the width of the
internal border, and the @samp{borderWidth} resource controls the width
of the external border.  Both of these resources are part of the
@samp{BorderWidth} class.  Case distinctions are significant in these
names.

  In @file{~/.Xdefaults}, you can specify a value for a single resource
on one line, like this:

@example
emacs.borderWidth: 2
@end example

@noindent
Or you can use a class name to specify the same value for all resources
in that class.  Here's an example:

@example
emacs.BorderWidth: 2
@end example

  If you specify a value for a class, it becomes the default for all
resources in that class.  You can specify values for individual
resources as well; these override the class value, for those particular
resources.  Thus, this example specifies 2 as the default width for all
borders, but overrides this value with 4 for the external border:

@example
emacs.BorderWidth: 2
emacs.borderWidth: 4
@end example

  The order in which the lines appear in the file does not matter.
Also, command-line options always override the X resources file.

  The string @samp{emacs} in the examples above is also a resource
name.  It actually represents the name of the executable file that you
invoke to run Emacs.  If Emacs is installed under a different name, it
looks for resources under that name instead of @samp{emacs}.

@table @samp
@item -name @var{name}
@opindex --name
@itemx --name=@var{name}
@cindex resource name, command-line argument
Use @var{name} as the resource name (and the title) for the initial
Emacs frame.  This option does not affect subsequent frames, but Lisp
programs can specify frame names when they create frames.

If you don't specify this option, the default is to use the Emacs
executable's name as the resource name.

@item -xrm @var{resource-values}
@opindex --xrm
@itemx --xrm=@var{resource-values}
@cindex resource values, command-line argument
Specify X resource values for this Emacs job (see below).
@end table

  For consistency, @samp{-name} also specifies the name to use for
other resource values that do not belong to any particular frame.

  The resources that name Emacs invocations also belong to a class; its
name is @samp{Emacs}.  If you write @samp{Emacs} instead of
@samp{emacs}, the resource applies to all frames in all Emacs jobs,
regardless of frame titles and regardless of the name of the executable
file.  Here is an example:

@example
Emacs.BorderWidth: 2
Emacs.borderWidth: 4
@end example

  You can specify a string of additional resource values for Emacs to
use with the command line option @samp{-xrm @var{resources}}.  The text
@var{resources} should have the same format that you would use inside a file
of X resources.  To include multiple resource specifications in
@var{resources}, put a newline between them, just as you would in a file.
You can also use @samp{#include "@var{filename}"} to include a file full
of resource specifications.  Resource values specified with @samp{-xrm}
take precedence over all other resource specifications.

  The following table lists the resource names that designate options
for Emacs, each with the class that it belongs to:

@table @asis
@item @code{background} (class @code{Background})
Background color name.

@item @code{bitmapIcon} (class @code{BitmapIcon})
Use a bitmap icon (a picture of a gnu) if @samp{on}, let the window
manager choose an icon if @samp{off}.

@item @code{borderColor} (class @code{BorderColor})
Color name for the external border.

@item @code{borderWidth} (class @code{BorderWidth})
Width in pixels of the external border.

@item @code{cursorColor} (class @code{Foreground})
Color name for text cursor (point).

@item @code{font} (class @code{Font})
Font name for text (or fontset name, @pxref{Fontsets}).

@item @code{foreground} (class @code{Foreground})
Color name for text.

@item @code{geometry} (class @code{Geometry})
Window size and position.  Be careful not to specify this resource as
@samp{emacs*geometry}, because that may affect individual menus as well
as the Emacs frame itself.

If this resource specifies a position, that position applies only to the
initial Emacs frame (or, in the case of a resource for a specific frame
name, only that frame).  However, the size, if specified here, applies to
all frames.

@item @code{iconName} (class @code{Title})
Name to display in the icon.

@item @code{internalBorder} (class @code{BorderWidth})
Width in pixels of the internal border.

@item @code{lineSpacing} (class @code{LineSpacing})
@cindex line spacing
@cindex leading
Additional space (@dfn{leading}) between lines, in pixels.

@item @code{menuBar} (class @code{MenuBar})
Give frames menu bars if @samp{on}; don't have menu bars if @samp{off}.

@item @code{toolBar} (class @code{ToolBar})
Number of lines to reserve for the tool bar.  A zero value suppresses
the tool bar.  If the value is non-zero and
@code{auto-resize-tool-bars} is non-@code{nil}, the tool bar's size
will be changed automatically so that all tool bar items are visible.

@item @code{minibuffer} (class @code{Minibuffer})
If @samp{none}, don't make a minibuffer in this frame.
It will use a separate minibuffer frame instead.

@item @code{paneFont} (class @code{Font})
@cindex font for menus
Font name for menu pane titles, in non-toolkit versions of Emacs.

@item @code{pointerColor} (class @code{Foreground})
Color of the mouse cursor.

@ignore
@item @code{privateColormap} (class @code{PrivateColormap})
If @samp{on}, use a private color map, in the case where the ``default
visual'' of class PseudoColor and Emacs is using it.
@end ignore

@item @code{reverseVideo} (class @code{ReverseVideo})
Switch foreground and background default colors if @samp{on}, use colors as
specified if @samp{off}.

@item @code{screenGamma} (class @code{ScreenGamma})
@cindex gamma correction
Gamma correction for colors, equivalent to the frame parameter
@code{screen-gamma}.

@item @code{selectionFont} (class @code{Font})
Font name for pop-up menu items, in non-toolkit versions of Emacs.  (For
toolkit versions, see @ref{Lucid Resources}, also see @ref{LessTif
Resources}.)

@item @code{synchronous} (class @code{Synchronous})
@cindex debugging X problems
@cindex synchronous X mode
Run Emacs in synchronous mode if @samp{on}.  Synchronous mode is
useful for debugging X problems.

@item @code{title} (class @code{Title})
Name to display in the title bar of the initial Emacs frame.

@item @code{verticalScrollBars} (class @code{ScrollBars})
Give frames scroll bars if @samp{on}; don't have scroll bars if
@samp{off}.
@end table

  Here are resources for controlling the appearance of particular faces
(@pxref{Faces}):

@table @code
@item @var{face}.attributeFont
Font for face @var{face}.
@item @var{face}.attributeForeground
Foreground color for face @var{face}.
@item @var{face}.attributeBackground
Background color for face @var{face}.
@item @var{face}.attributeUnderline
Underline flag for face @var{face}.  Use @samp{on} or @samp{true} for
yes.
@item @var{face}.attributeFamily
Font family for face @var{face}.
@item @var{face}.attributeWidth
Relative proportional width of the font to use for face @var{face}.
It should be one of @code{ultra-condensed}, @code{extra-condensed},
@code{condensed}, @code{semi-condensed}, @code{normal},
@code{semi-expanded}, @code{expanded}, @code{extra-expanded}, or
@code{ultra-expanded}.
@item @var{face}.attributeHeight
Height of the font to use for face @var{face}: either an integer
specifying the height in units of 1/10@dmn{pt}, or a floating point
number that specifies a scale factor to scale the underlying face's
default font, or a function to be called with the default height which
will return a new height.
@item @var{face}.attributeWeight
A weight to use for the face @var{face}.  It must be one of
@code{ultra-bold}, @code{extra-bold}, @code{bold},
@code{semi-bold}, @code{normal}, @code{semi-light}, @code{light},
@code{extra-light}, @code{ultra-light}.
@item @var{face}.attributeSlant
The slant to use for the font of face @var{face}.  It must be one of
@code{italic}, @code{oblique}, @code{normal},
@code{reverse-italic}, or @code{reverse-oblique}.
@item @var{face}.attributeStrikeThrough
Whether the face @var{face} should be drawn with a line striking
through the characters.
@item @var{face}.attributeOverline
Whether the characters in the face @var{face} should be overlined.
@item @var{face}.attributeBox
Whether to draw a box around the characters in face @var{face}.
@item @var{face}.attributeInverse
Whether to display the characters in face @var{face} in inverse
video.
@item @var{face}.attributeStipple
The name of a pixmap data file to use for the stipple pattern, or
@code{false} to not use stipple for the face @var{face}.
@item @var{face}.attributeBackgroundPixmap
The background pixmap for the face @var{face}.  Should be a name of a
pixmap file or @code{false}.
@item @var{face}.attributeBold
Whether to draw the characters in the face @var{face} as bold.
@item @var{face}.attributeItalic
Whether to draw the characters in the face @var{face} as italic.
@end table

@node Lucid Resources
@appendixsec Lucid Menu X Resources
@cindex Menu X Resources (Lucid widgets)
@cindex Lucid Widget X Resources

  If the Emacs installed at your site was built to use the X toolkit
with the Lucid menu widgets, then the menu bar is a separate widget and
has its own resources.  The resource names contain @samp{pane.menubar}
(following, as always, the name of the Emacs invocation, or @samp{Emacs},
which stands for all Emacs invocations).  Specify them like this:

@example
Emacs.pane.menubar.@var{resource}:  @var{value}
@end example

@noindent
For example, to specify the font @samp{8x16} for the menu-bar items,
write this:

@example
Emacs.pane.menubar.font:  8x16
@end example

@noindent
Resources for @emph{non-menubar} toolkit pop-up menus have
@samp{menu*}, in like fashion.  For example, to specify the font
@samp{8x16} for the pop-up menu items, write this:

@example
Emacs.menu*.font:	8x16
@end example

@noindent
For dialog boxes, use @samp{dialog} instead of @samp{menu}:

@example
Emacs.dialog*.font:	8x16
@end example

@noindent
Experience shows that on some systems you may need to add
@samp{shell.}@: before the @samp{pane.menubar} or @samp{menu*}.  On
some other systems, you must not add @samp{shell.}.

  Here is a list of the specific resources for menu bars and pop-up menus:

@table @code
@item font
Font for menu item text.
@item foreground
Color of the foreground.
@item background
Color of the background.
@item buttonForeground
In the menu bar, the color of the foreground for a selected item.
@item horizontalSpacing
Horizontal spacing in pixels between items.  Default is 3.
@item verticalSpacing
Vertical spacing in pixels between items.  Default is 1.
@item arrowSpacing
Horizontal spacing between the arrow (which indicates a submenu) and
the associated text.  Default is 10.
@item shadowThickness
Thickness of shadow line around the widget.
@item margin
The margin of the menu bar, in characters.  The default of 4 makes the
menu bar appear like the LessTif/Motif one.
@end table

@node LessTif Resources
@appendixsec LessTif Menu X Resources
@cindex Menu X Resources (LessTif widgets)
@cindex LessTif Widget X Resources

  If the Emacs installed at your site was built to use the X toolkit
with the LessTif or Motif widgets, then the menu bar, the dialog
boxes, the pop-up menus, and the file-selection box are separate
widgets and have their own resources.

  The resource names for the menu bar contain @samp{pane.menubar}
(following, as always, the name of the Emacs invocation, or
@samp{Emacs}, which stands for all Emacs invocations).  Specify them
like this:

@smallexample
Emacs.pane.menubar.@var{subwidget}.@var{resource}:  @var{value}
@end smallexample

  Each individual string in the menu bar is a subwidget; the subwidget's
name is the same as the menu item string.  For example, the word
@samp{File} in the menu bar is part of a subwidget named
@samp{emacs.pane.menubar.File}.  Most likely, you want to specify the
same resources for the whole menu bar.  To do this, use @samp{*} instead
of a specific subwidget name.  For example, to specify the font
@samp{8x16} for the menu-bar items, write this:

@smallexample
Emacs.pane.menubar.*.fontList:  8x16
@end smallexample

@noindent
This also specifies the resource value for submenus.

  Each item in a submenu in the menu bar also has its own name for X
resources; for example, the @samp{File} submenu has an item named
@samp{Save (current buffer)}.  A resource specification for a submenu
item looks like this:

@smallexample
Emacs.pane.menubar.popup_*.@var{menu}.@var{item}.@var{resource}: @var{value}
@end smallexample

@noindent
For example, here's how to specify the font for the @samp{Save (current
buffer)} item:

@smallexample
Emacs.pane.menubar.popup_*.File.Save (current buffer).fontList: 8x16
@end smallexample

@noindent
For an item in a second-level submenu, such as @samp{Complete Word}
under @samp{Spell Checking} under @samp{Tools}, the resource fits this
template:

@smallexample
Emacs.pane.menubar.popup_*.popup_*.@var{menu}.@var{resource}: @var{value}
@end smallexample

@noindent
For example,

@smallexample
Emacs.pane.menubar.popup_*.popup_*.Spell Checking.Complete Word: @var{value}
@end smallexample

@noindent
(This should be one long line.)
  
  It's impossible to specify a resource for all the menu-bar items
without also specifying it for the submenus as well.  So if you want the
submenu items to look different from the menu bar itself, you must ask
for that in two steps.  First, specify the resource for all of them;
then, override the value for submenus alone.  Here is an example:

@smallexample
Emacs.pane.menubar.*.fontList:  8x16
Emacs.pane.menubar.popup_*.fontList: 8x16
@end smallexample

@noindent
For LessTif pop-up menus, use @samp{menu*} instead of
@samp{pane.menubar}.  For example, to specify the font @samp{8x16} for
the pop-up menu items, write this:

@smallexample
Emacs.menu*.fontList:  8x16
@end smallexample

@noindent
For LessTif dialog boxes, use @samp{dialog} instead of @samp{menu}:

@example
Emacs.dialog*.fontList: 8x16
Emacs.dialog*.foreground: hotpink
@end example

To specify resources for the LessTif file-selection box, use
@samp{fsb*}, like this:

@example
Emacs.fsb*.fontList: 8x16
@end example

@iftex
@medbreak
@end iftex
  Here is a list of the specific resources for LessTif menu bars and
pop-up menus:

@table @code
@item armColor
The color to show in an armed button.
@item fontList
The font to use.
@item marginBottom
@itemx marginHeight
@itemx marginLeft
@itemx marginRight
@itemx marginTop
@itemx marginWidth
Amount of space to leave around the item, within the border.
@item borderWidth
The width of the border around the menu item, on all sides.
@item shadowThickness
The width of the border shadow.
@item bottomShadowColor
The color for the border shadow, on the bottom and the right.
@item topShadowColor
The color for the border shadow, on the top and the left.
@end table