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bug#66434: grep recently shows the filename with -o , but it shouldn't.


From: Joerg M. Sigle
Subject: bug#66434: grep recently shows the filename with -o , but it shouldn't.
Date: Tue, 10 Oct 2023 12:58:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Hello GNU grep team

I have grep (GNU grep) 3.6 on a Debian / Devuan Linux system.

Recently I noticed that when using the -o switch, grep also shows the filename 
for each hit in front of the desired output, and a ":" as separator.
IIRC this was not the case in previous versions of grep [but please correct me 
if I'm wrong here].

In any case, the filename: is NOT shown before matching content when the -o 
switch is not used.

According to the manual, the -o switch should only limit output to matching 
parts, and NOT ADDITIONALLY activate the output of filename:

-o, --only-matching
        Print only the matched (non-empty) parts of a matching line, with each 
such part on a separate output line.


N.B.:
Showing the filename ONLY instead of matching lines/only matching part) IS 
already controlled with the -l switch.
So a different switch would be needed to show the filename IN ADDITION to the 
output of -o.
I think, somebody thought they'd do something beneficial by showing the 
filename in front of the output of -o, but I'm afraid they are not.
And I'm also afraid that this needs some workaround to remove the filename 
again for many applications of grep,
so changing back to the expected behaviour might cause trouble again, of course.

Example:

$ grep  -o PV1.... *.hl7

Currently produced output (supposedly wrong):

PAT_20231010_112021_010166.hl7:PV1|1|O
PAT_20231010_112021_010167.hl7:PV1|1|O
PAT_20231010_112420_010168.hl7:PV1|1|I
PAT_20231010_112421_010169.hl7:PV1|1|I
PAT_20231010_112421_010170.hl7:PV1|1|I
...

Desired output (supposedly right):
PV1|1|O
PV1|1|O
PV1|1|I
PV1|1|I
PV1|1|I
...

Thanks and kind regards, Joerg Sigle

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Dr. med. Jörg M. Sigle                             +41 76 276 86 94
http://www.ql-recorder.com                         +41 32 510 23 46
http://www.jsigle.com                           +49 176 96 43 54 13





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