GNU bug report logs - #9808
sort behavior

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eric Blake <eblake <at> redhat.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#9808: closed (sort behavior)
Date: Thu, 20 Oct 2011 13:51:02 +0000

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Your message dated Thu, 20 Oct 2011 07:48:58 -0600
with message-id <4EA026CA.1020604 <at> redhat.com>
and subject line Re: sort behavior [was: bug#9808: bug report]
has caused the debbugs.gnu.org bug report #9808,
regarding sort behavior
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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9808: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9808
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Contact help-debbugs <at> gnu.org with problems

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From: mohamad hadi kianersi <mohamad.hadi.kianersi <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: bug report
Date: Thu, 20 Oct 2011 14:32:12 +0330

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Hi
when use sort with option k(key)r(revers) after these options when use
n(numeric)  dont sort with numeric option


-- 

Mohamad Hadi Kianersi

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From: Eric Blake <eblake <at> redhat.com>
To: mohamad hadi kianersi <mohamad.hadi.kianersi <at> gmail.com>,
	9808-done <at> debbugs.gnu.org
Subject: Re: sort behavior [was: bug#9808: bug report]
Date: Thu, 20 Oct 2011 07:48:58 -0600

tag 9808 = notabug
thanks

Re-adding the list, so that others may benefit from the solution or 
chime in with suggestions.

On 10/20/2011 07:36 AM, mohamad hadi kianersi wrote:
> yes,but view these
>
> 1.
> [hadi <at> hadi ~]$  printf '10 a\n1 b\n2 c\n' | sort -k1,1 -r -n
> 10 a
> 2 c
> 1 b
>
> but
> [hadi <at> hadi ~]$  printf '10 a\n1 b\n2 c\n' | sort -k1,1r -n
> 2 c
> 10 a
> 1 b
> cant sorted with numeric

Did you try 'sort --debug' like I suggested?

$ printf '10 a\n1 b\n2 c\n' | LC_ALL=C sort -k1,1r -n --debug
sort: using simple byte comparison
sort: option `-n' is ignored
2 c
_
___
10 a
__
____
1 b
_
___

Notice - sort is _correctly_ ignoring -n, and --debug even tells you so, 
per the rules given by POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sort.html

"The following options shall override the default ordering rules. When 
ordering options appear independent of any key field specifications, the 
requested field ordering rules shall be applied globally to all sort 
keys. When attached to a specific key (see -k), the specified ordering 
options shall override all global ordering options for that key." [d, f, 
i, n, r]

That is, the moment you use -k with r attached, then the global -n no 
longer applies to that -k; to get both r and n behavior on a single key, 
you have to attach both options to that -k:

$ printf '10 a\n1 b\n2 c\n' | LC_ALL=C sort -k1,1rn --debug
sort: using simple byte comparison
10 a
__
____
2 c
_
___
1 b
_
___

As such, I'm closing this bug report, now that we know the problem was a 
usage error and not a bug in sort.

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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