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Date:	Sat, 12 Sep 2009 11:06:39 +0300
From:	Eli Zaretskii <eliz AT gnu DOT org>
Subject:	Re: Set default options
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> From: Robert Riebisch <Robert DOT Riebisch AT arcor DOT de>
> Date: Fri, 11 Sep 2009 22:49:40 +0200
> 
> 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.

You could define an alias in both Bash and cmd.exe (but not in
command.com, AFAIK).  With cmd.exe, you say something like this
(untested):

    doskey diff=diff -aprNU5 $*

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