Emacs Batch Edit Example

Say the following function is in your .emacs file and lets you indent your C source code to your liking:

	(defun c-indent-file (filename)
	(interactive)
	(find-file filename)
	(mark-whole-buffer)
	(c-indent-line-or-region)
	(save-buffer))

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But you don't want to manually open each file into an Emacs buffer to execute this script. Emacs batch editing to the rescue:

emacs --batch -l '/home/dburger/.emacs' --eval '(c-indent-file "/home/dburger/test.c")'

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The parameters load up my .emacs file as normal and runs the given eval. Apply a little command line magic and you should be able to exploit Emacs from the command line in a very efficient way.