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About `diff-reverse-direction'

From: Xue Fuqiao
Subject: About `diff-reverse-direction'
Date: Tue, 5 Feb 2013 11:49:12 +0800 
What does the command 'diff-reverse-direction' do?  The docstring only
says it "reverses the direction of the diffs".  Does that mean changing

  diff -c /home/xfq/.emacs.d/backups/.emacs\~ /home/xfq/.emacs

to

  diff -c /home/xfq/.emacs /home/xfq/.emacs.d/backups/.emacs\~

?

-- 
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao
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