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Subject: bug#76290: "sort -u" vs "sort -h -u": possible bug
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Rupert Gallagher <ruga@HIDDEN>
Subject: bug#76290: Acknowledgement ("sort -u" vs "sort -h -u": possible bug)
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Date: Fri, 14 Feb 2025 17:01:02 +0000

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76290: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76290
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Message sent to bug-coreutils@HIDDEN:

Subject: bug#76290: "sort -u" vs "sort -h -u": possible bug
References: <ZNVID461H0raZKe9Fs-sk_MlTsXxAeErUavTk_lwGb7oTJGSVrmHLxbttwtNzoNI8E4FUrY8hrvzy2IHeAZcTLNpxpW_BfyYgBqULvdt-yY=@protonmail.com>
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Resent-From: Paul Eggert <eggert@HIDDEN>
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Date: Sat, 15 Feb 2025 22:23:59 -0800
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I don't see a bug there, just an infelicity. -h means 'sort' should look 
for a number, and your data lines don't start with numbers.

Try 'sort --debug -h -u' to see more.

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Subject: bug#76290: "sort -u" vs "sort -h -u": possible bug
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Date: Sun, 16 Feb 2025 11:02:37 +0000
From: Rupert Gallagher <ruga@HIDDEN>
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My concern is best described as follows.

~ $ echo -e "CVE-2018-13787\nCVE-2019-16649\nCVE-2019-16650\nCVE-2020-15046=
\nCVE-2018-13787" | sort -h
CVE-2018-13787
CVE-2018-13787
CVE-2019-16649
CVE-2019-16650
CVE-2020-15046

~ $ echo -e "CVE-2018-13787\nCVE-2019-16649\nCVE-2019-16650\nCVE-2020-15046=
\nCVE-2018-13787" | sort -h -u
CVE-2018-13787

The introduction of the unique operator (-u) returns a wrong answer when us=
ed with the human sorting operator (-h).

Note the problem does not occur when the human sorting operator is not used=
.

~ $ echo -e "CVE-2018-13787\nCVE-2019-16649\nCVE-2019-16650\nCVE-2020-15046=
\nCVE-2018-13787" | sort
CVE-2018-13787
CVE-2018-13787
CVE-2019-16649
CVE-2019-16650
CVE-2020-15046

~ $ echo -e "CVE-2018-13787\nCVE-2019-16649\nCVE-2019-16650\nCVE-2020-15046=
\nCVE-2018-13787" | sort -u
CVE-2018-13787
CVE-2019-16649
CVE-2019-16650
CVE-2020-15046

The example suggests the existence of a programming error between the outpu=
t of -h and the input of -u.


-------- Original Message --------
On 2/16/25 07:23, Paul Eggert wrote:

>  I don't see a bug there, just an infelicity. -h means 'sort' should look=
 for a number, and your data lines don't start with numbers.
> =20
>  Try 'sort --debug -h -u' to see more.
>

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On Sun, 16 Feb 2025, at 06:23, Paul Eggert wrote:
> I don't see a bug there, just an infelicity. -h means 'sort' should look 
> for a number, and your data lines don't start with numbers.
>
> Try 'sort --debug -h -u' to see more.

The --debug output here isn't as helpful as it could be; taking a simplified example

$ echo -e 'CVE-222\nCVE-111\nCVE-222' | sort -h -u --debug
sort: text ordering performed using simple byte comparison
sort: note numbers use '.' as a decimal point in this locale
CVE-222
^ no match for key

$ echo $'bbb\naaa' | sort -n -u --debug
sort: text ordering performed using simple byte comparison
sort: note numbers use '.' as a decimal point in this locale
bbb
^ no match for key


Due to the diligent work by maintainers, there are very few genuine bugs in sort, so we can assume --debug users need as much help as possible figuring out where the sort options have gone wrong. How could the "no match for key" output here be clearer? Could --uniq --debug show elided lines with an explanation, especially for entire lines which match nothing?


Cheers,
Phil

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On 2025-02-16 03:02, Rupert Gallagher wrote:
> The introduction of the unique operator (-u) returns a wrong answer when used with the human sorting operator (-h).

The answer is "wrong" only in the sense that sort's documented and 
implemented behavior is not what you expect.

To fix this mismatch between behavior and expectations, don't use -h. It 
makes sense to not use -h, -h is not intended for uses like that.

Last modified: Sun, 16 Feb 2025 22:30:02 UTC

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