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From: "Allan" <mu8ja0i AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
References: <7gvrf4F2qu23dU1 AT mid DOT individual DOT net>
Subject: Re: Set default options
Date: Fri, 11 Sep 2009 18:04:23 -0500
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"Robert Riebisch" <Robert DOT Riebisch AT arcor DOT de> wrote in message 
news:7gvrf4F2qu23dU1 AT mid DOT individual DOT net...
> Hi!
>
> I use GNU diffutils very often. Shell is either command.com / cmd.exe or
> bash.exe Is there any way to pass some default options to diff.exe? I'd
> like to make "-aprNU5" default.
>
If you invoke diff from within emacs there is the variable `diff-switches'.