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From: Eli Zaretskii <eliz@elta.co.il>
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Subject: Re: error message
Date: 11 Jan 2004 07:48:41 +0200
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> From: wsgr12@yahoo.com (wsgr12)
> Newsgroups: gnu.emacs.help
> Date: 10 Jan 2004 17:44:44 -0800
> 
> I installed emacs on winxp and got the message. Please advise.
> 
> cd c:/test/test
> grep -n max  NUL
> 'grep' is not recognized as an internal or external command,
> operable program or batch file.

"M-x grep" invokes an external program called grep.exe.  If you don't
have it installed, or it is not somewhere along the PATH that is
known to Emacs, you will see this message.

Solution: install a port of GNU Grep so that Emacs can find it.