Subject: grep --exclude does not match files as documented in man page
From: ANDREUX Hugues <[email-masked]>
To: "[email-masked]" <[email-masked]>
Date: Thu, 12 Jun 2014 12:05:52 +0000
List-Id: <debbugs-submit.debbugs.gnu.org>

It seems file globbing as done by 'grep --exclude' is broken when wildcards are used.

$ echo foo >bar
$ grep --exclude='.*' . ./bar
$ grep --exclude='.*' . bar
foo

Expected behavior: grep -exclude should not exclude bar, whether it is prefixed by ./ or not. According to the man page:
"       --exclude=GLOB
              Skip files whose *base name* matches GLOB (using wildcard matching). [...]"

This behavior seems to only occur with whenever a directory component of the file path matches the GLOB, e.g.:
$ grep --exclude '.*' . ../bar
$ grep --exclude '.*' . .../bar
$ grep --exclude '.*' . .TEST/bar
$ grep --exclude '.*' . hugues/.TEST/bar

The bug triggers with other globs, unless there is no wildcard:
$ grep --exclude 'w*' . work/bar
$ grep --exclude 'work' . work/bar
foo

Regards,

Hugues Andreux
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