bug in grep -F -w

[Steve Keay]

I've found a problem where fgrep -w fails to match words if an earlier
line of input contains the search string.  In the following example,
grep fails to match "bug" on the second line of input.  This is caused
by the first line of input which contains "bug" as a substring.

This problem has been reproduced with grep built from source on
Solaris and Linux.

$ cat words
bugs
bug
$ grep -F -w bug words
$ grep --version
grep (GNU grep) 2.5.1

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Regards,
-- 
Steve Keay