Re: Problem with grep -Fwf (version 2.5.1a-1 and 2.5.1a-2)

[Christopher Faylor <cgf-no-personal-reply-please 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

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