X-Spam-Check-By: sourceware.org
Date: Fri, 28 Jul 2006 15:05:02 -0400
From: Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Problem with grep -Fwf (version 2.5.1a-1 and 2.5.1a-2)
Message-ID: <20060728190502.GA8071@trixie.casa.cgf.cx>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
References: <eadiub$tfs$1 AT sea DOT gmane DOT org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <eadiub$tfs$1@sea.gmane.org>
User-Agent: Mutt/1.5.11
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On Fri, Jul 28, 2006 at 01:53:32PM -0400, Daniel Einspanjer wrote:
>Using the following files both of which had dos2unix run on them to be sure 
>there were no line-ending issues:
>
>===== data.txt =======
>abc
>defghi
   ^
>======================
>
>===== filter.txt =====
>abc
>deghi
>======================
>
>These commands work as expected:
>$ fgrep -f filter.txt data.txt
>$ tail -1 data.txt | fgrep -wf filter.txt
>
>But this command fails to return ghi:
>$ fgrep -wf filter.txt data.txt
>So it seems that after a match is discarded because it is not a full word 
>(due to the -w flag), subsequent full word matches are also discarded.

Maybe it's a typo in your simplified test case but fgrep -w shouldn't match
defghi since the input is deghi.

>I've tested this with the grep 2.5.1 installed on a recent Gentoo GNU/Linux 
>machine and it behaves properly so I am guessing it might be a problem 
>specific to the cygwin port.

I tried this test on Cygwin, Gentoo, and FC5 and got consistent results
on all.  If I remove the 'f' in defghi from data.txt then it also works
consistently on all three systems, i.e., it returns:

abc
deghi

cgf

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/