GNU bug report logs - #42623
fgrep -x -f problem

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Arthur Goldberg <artgoldberg <at> gmail.com>
To: bug-grep <at> gnu.org
Subject: fgrep -x -f problem
Date: Thu, 30 Jul 2020 12:16:11 -0400

[Message part 1 (text/plain, inline)]

Hi Gnu grep folks

I believe that

fgrep -x -f file file

should output the contents of `file`. However, it outputs something very 
different for the attached file.

command:

fgrep -x -f dfba.py dfba.py > actual_output.txt

versions:

$ uname -a
Linux 8845f126fe89 4.19.76-linuxkit #1 SMP Thu Oct 17 19:31:58 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

$ fgrep --version
grep (GNU grep) 3.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and others, see 
<http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>.

Thanks

Arthur

-- 
Arthur Goldberg
https://www.linkedin.com/in/arthurgoldberg
artgoldberg <at> gmail.com

[actual_output.txt (text/plain, attachment)]

[dfba.py (text/x-python-script, attachment)]

Message #8 received at 42623 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Arthur Goldberg <artgoldberg <at> gmail.com>
Cc: 42623 <at> debbugs.gnu.org
Subject: Re: bug#42623: fgrep -x -f problem
Date: Thu, 30 Jul 2020 11:48:05 -0700

On 7/30/20 9:16 AM, Arthur Goldberg wrote:

> fgrep -x -f dfba.py dfba.py > actual_output.txt

That command works just fine for me with the file you attached. That is, this 
command:

fgrep -x -f dfba.py dfba.py | cmp - dfba.py

outputs nothing, as expected. This is on Ubuntu 18.04.4 which has fgrep 3.1 
(same as what you have).

I noticed that the file actual_output.txt that you attached had trailing CR at 
the end of each line, which would cause 'diff' to report a difference at any 
line. So perhaps the problem has to do with a Microsoft-oriented file system in 
your environment, or something like that.

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