@rnindex current-input-port
@deffn {Scheme Procedure} current-input-port
@deffnx {C Function} scm_current_input_port ()
+@cindex standard input
Return the current input port. This is the default port used
by many input procedures. Initially, @code{current-input-port}
returns the @dfn{standard input} in Unix and C terminology.
@rnindex current-output-port
@deffn {Scheme Procedure} current-output-port
@deffnx {C Function} scm_current_output_port ()
+@cindex standard output
Return the current output port. This is the default port used
by many output procedures. Initially,
@code{current-output-port} returns the @dfn{standard output} in
@deffn {Scheme Procedure} current-error-port
@deffnx {C Function} scm_current_error_port ()
+@cindex standard error output
Return the port to which errors and warnings should be sent (the
@dfn{standard error} in Unix and C terminology).
@end deffn