GNU bug report logs - #19533
comm does not detect common lines -- Mac OS X 10.9.5

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ali Khanafer <ali.khanafer <at> gmail.com>
Subject: bug#19533: closed (Re: bug#19533: comm does not detect common
 lines -- Mac OS X 10.9.5)
Date: Wed, 07 Jan 2015 22:13:03 +0000

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Your bug report

#19533: comm does not detect common lines -- Mac OS X 10.9.5

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 19533 <at> debbugs.gnu.org.

-- 
19533: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19533
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eric Blake <eblake <at> redhat.com>
To: Ali Khanafer <ali.khanafer <at> gmail.com>, 19533-done <at> debbugs.gnu.org
Subject: Re: bug#19533: comm does not detect common lines -- Mac OS X 10.9.5
Date: Wed, 07 Jan 2015 15:12:26 -0700

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tag 19533 notabug
thanks

On 01/07/2015 02:23 PM, Ali Khanafer wrote:
> Hello,
> 
> Thanks for this amazing tool.
> 
> I tried comm on test1.txt and test2.txt. The output I got is in
> comm-test.txt. Comm found 11 common lines and missed 6 other lines.
> 
> Could you please explain why this is happening?

Using a newer version of coreutils would tell you why:

$ comm test1 test2
		1266281
		11348282
		15431856
16264803
		17248121
		17384099
18911432
	20513956
		21436960
		21634600
		24129206
		33773592
		37710752
		44903491
comm: file 1 is not in sorted order
103652294
103865085
126302054
198494684
208442526
253536357
1002513128

	46959037
	51274038
comm: file 2 is not in sorted order
	103652294
	103865085
	126302054
	208442526
	253536357
	1002513128

Proper use of comm requires that you pre-sort both input files.  As
such, this is not a bug in comm, so I'm closing this bug.  However, feel
free to add further comments or questions.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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From: Ali Khanafer <ali.khanafer <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: comm does not detect common lines -- Mac OS X 10.9.5
Date: Wed, 7 Jan 2015 16:23:25 -0500

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Hello,

Thanks for this amazing tool.

I tried comm on test1.txt and test2.txt. The output I got is in
comm-test.txt. Comm found 11 common lines and missed 6 other lines.

Could you please explain why this is happening?

Thank you in advance.

Best,
Ali

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[comm-test (application/octet-stream, attachment)]

[test2 (application/octet-stream, attachment)]

[test1 (application/octet-stream, attachment)]

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