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Showing content from http://www.gnu.org/software/emacs/manual/html_node/emacs/Command-Example.html below:

Command Example (GNU Emacs Manual)

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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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