GNU Emacs Manual - Command Example

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## Command Argument Example

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

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

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

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