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You can use command-line arguments to request various actions when you start Emacs. Since you do not need to start Emacs more than once per day, and will often leave your Emacs session running longer than that, command-line arguments are hardly ever used. As a practical matter, it is best to avoid making the habit of using them, since this habit would encourage you to kill and restart Emacs unnecessarily often. These options exist for two reasons: to be compatible with other editors (for invocation by other programs) and to enable shell scripts to run specific Lisp programs.
This section describes how Emacs processes command-line arguments, and how you can customize them.
This function parses the command line that Emacs was called with, processes it, loads the user's init file and displays the startup messages.
The value of this variable is t once the command line has been
processed.
If you redump Emacs by calling dump-emacs, you may wish to set this
variable to nil first in order to cause the new dumped Emacs to
process its new command-line arguments.
The value of this variable is an alist of user-defined command-line options and associated handler functions. This variable exists so you can add elements to it.
A command-line option is an argument on the command line, which has the form:
-option |
The elements of the command-switch-alist look like this:
(option . handler-function) |
The CAR, option, is a string, the name of a command-line option (not including the initial hyphen). The handler-function is called to handle option, and receives the option name as its sole argument.
In some cases, the option is followed in the command line by an argument.
In these cases, the handler-function can find all the remaining
command-line arguments in the variable command-line-args-left. (The
entire list of command-line arguments is in command-line-args.)
The command-line arguments are parsed by the command-line-1 function
in the ‘startup.el’ file. See also (emacs)Emacs Invocation section `Command Line Arguments for Emacs Invocation' dans The GNU Emacs Manual.
The value of this variable is the list of command-line arguments passed to Emacs.
This variable's value is a list of functions for handling an unrecognized
command-line argument. Each time the next argument to be processed has no
special meaning, the functions in this list are called, in order of
appearance, until one of them returns a non-nil value.
These functions are called with no arguments. They can access the
command-line argument under consideration through the variable argi,
which is bound temporarily at this point. The remaining arguments (not
including the current one) are in the variable
command-line-args-left.
When a function recognizes and processes the argument in argi, it
should return a non-nil value to say it has dealt with that
argument. If it has also dealt with some of the following arguments, it can
indicate that by deleting them from command-line-args-left.
If all of these functions return nil, then the argument is used as a
file name to visit.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.