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 - are 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 -- says
that all subsequent arguments are file names, not options, even if
they start with -.
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 -, and the long forms that start with --. For
example, -d is a short form and --display is the
corresponding long form.
The long forms with -- 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
--display sugar-bombs:0.0 or --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.
Most options specify how to initialize Emacs, or set parameters for
the Emacs session. We call them initial options. A few options
specify things to do: for example, load libraries, call functions, or
terminate Emacs. These are called action options. These and file
names together are called action arguments. Emacs processes all
the action arguments in the order they are written.
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