GNU bug report logs - #72617
sort -n loses lines.

Previous Next

Full log

View this message in rfc822 format

From: Simon B <simon.buongiorno <at> gmail.com>
To: P <at> draigbrady.com
Cc: 72617 <at> debbugs.gnu.org
Subject: bug#72617: sort -n loses lines.
Date: Wed, 14 Aug 2024 12:04:58 +0200

On Wed, 14 Aug 2024 at 11:48, Pádraig Brady <P <at> draigbrady.com> wrote:
>
> tag 72617 notabug
> close 72617
> stop
>
> On 14/08/2024 09:43, Simon B wrote:
> > Hallo,
> >
> > The output of my grep command is:
> >
> > # grep -i "sshd" /root/access.report | egrep -o
> >   '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-
> > 9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
> > 64.227.127.122
> > 172.169.5.249
> > 172.169.6.164
>
> Adding the --debug option shows the issue.
> I.e. the '.' being considered as part of a number:
>
> $ sort --debug -rbn -s ips
> sort: text ordering performed using ‘en_IE.UTF-8’ sorting rules
> sort: note numbers use ‘.’ as a decimal point in this locale
> 178.128.44.128
> _______
> 172.169.6.164
> _______
> 172.169.5.249
> _______
>
>
> Taking the example for sorting IPv4 addresses from the manual,
> shows the desired comparisons being performed:
>
> $ sort --debug -t '.' -k 1,1rn -k 2,2rn -k 3,3rn -k 4,4rn -u ips
> sort: text ordering performed using ‘en_IE.UTF-8’ sorting rules
> sort: numbers use ‘.’ as a decimal point in this locale
> 178.128.44.128
> ___
>      ___
>          __
>             ___
> 172.169.6.164
> ___
>      ___
>          _
>            ___
> 172.169.5.249
> ___
>      ___
>          _
>            ___
>

Hi Pádraig

I am largely satisfied by your great explanation,

I am still confused why lines go "missing" though.

Unsorted output
# grep -i "sshd" /root/access.report | egrep -o
'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
| wc -l
41
Sorted once:
# grep -i "sshd" /root/access.report |  egrep -o
'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
| sort -urbn | wc -l
15
Sorted workaround:
# grep -i "sshd" /root/access.report | egrep -o
'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
| sort -urb | sort -nr | wc -l
17

Even if the dot is being interpreted, it still should not lose the
line containing 172.169.6.164

Regards

Simon

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.