GNU bug report logs - #13144
"comm" bug or strange behaviour

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

From: Matteo Zambelli <mat.zambelli <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: "comm" bug or strange behaviour
Date: Tue, 11 Dec 2012 18:53:46 +0100

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

Hi, i was trying to find common lines between the two attached
files(both created with "dpkg --get-selections > filename.txt") with
this command:

comm -12 squeeze-xfce-installed_packages.txt
squeeze-xfce-installed_packages.txt > result.txt

then i noticed that the line:

libcdio10                                       install

that is regularly present in both files, doesn't appear in the
result(as well as few other lines).
I have tried with option "--nocheck-order" and such, but those common
lines are still missing in the output file.

Here's my uname -a:
Linux wheezy-dvd-exp 3.2.0-4-686-pae #1 SMP Debian 3.2.32-1 i686 GNU/Linux

Thanks for help ;)

[squeeze-xfce-installed_packages.txt (text/plain, attachment)]

[squeeze-lxde-installed_packages.txt (text/plain, attachment)]

Message #8 received at 13144 <at> debbugs.gnu.org (full text, mbox):

From: Bob Proulx <bob <at> proulx.com>
To: Matteo Zambelli <mat.zambelli <at> gmail.com>
Cc: 13144 <at> debbugs.gnu.org
Subject: Re: bug#13144: "comm" bug or strange behaviour
Date: Tue, 11 Dec 2012 21:53:57 -0700

Matteo Zambelli wrote:
> Hi, i was trying to find common lines between the two attached
> files(both created with "dpkg --get-selections > filename.txt") with
> this command:
> 
> comm -12 squeeze-xfce-installed_packages.txt squeeze-xfce-installed_packages.txt > result.txt
> 
> then i noticed that the line:
> 
> libcdio10                                       install
> 
> that is regularly present in both files, doesn't appear in the
> result(as well as few other lines).

Thank you for the report.  Also thank you for including the data sets
needed to reproduce the activity.  That's great.

Unfortunately I cannot reproduce your result.

  $ comm -12 squeeze-xfce-installed_packages.txt squeeze-xfce-installed_packages.txt | grep libcdio10
  libcdio10					install

And so there it is in the output??

> I have tried with option "--nocheck-order" and such, but those common
> lines are still missing in the output file.

Try 'sort -c' to check the sort ordering of both files.  (Looked okay
to me but it is locale dependent.)

What is your 'locale' setting?  (Affects sort order.)

  $ locale

In this case it shouldn't matter but what version of comm are you
using?  I know you reported your kernel version but that isn't really
associated.  (Think Squeeze with Backports.)

  $ comm --version

Verify that the 'comm' binary that you are running is the expected
one:

  $ type comm
  comm is hashed (/usr/bin/comm)

Bob

Message #13 received at 13144 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 13144 <at> debbugs.gnu.org
Subject: Re: bug#13144: "comm" bug or strange behaviour
Date: Tue, 23 Oct 2018 16:36:02 -0600

close 13144
stop

(triaging old bugs)

On 11/12/12 09:53 PM, Bob Proulx wrote:
> Matteo Zambelli wrote:
>> Hi, i was trying to find common lines between the two attached
>> files(both created with "dpkg --get-selections > filename.txt") with
>> this command:
>>
>> comm -12 squeeze-xfce-installed_packages.txt squeeze-xfce-installed_packages.txt > result.txt
>>
> [...]
> Unfortunately I cannot reproduce your result.
> 
>    $ comm -12 squeeze-xfce-installed_packages.txt squeeze-xfce-installed_packages.txt | grep libcdio10
>    libcdio10					install
> 
> And so there it is in the output??

With no further comments to Bob's explanation in 6 years,
I'm closing this bug.

-assaf

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