GNU bug report logs - #16831
don't say uniq -D -c is meaningless

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

From: mcmasters <daniel_mcmasters <at> merck.com>
To: Bug-coreutils <at> gnu.org
Subject: Re: don't say uniq -D -c is meaningless
Date: Fri, 21 Feb 2014 06:28:47 -0800 (PST)

I think uniq -D -c may be meaningful when used in conjuction with -f
Specifically, I wanted to use uniq -D -c -f 1 to find lines that are
identical with respect to field 2 (-f 1), get a listing of how many times
they occur (-c), but not throw away the differences in field 1 (-D)
Is there a way to do that with uniq?



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Message #8 received at 16831 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: mcmasters <daniel_mcmasters <at> merck.com>
Cc: 16831 <at> debbugs.gnu.org
Subject: Re: bug#16831: don't say uniq -D -c is meaningless
Date: Fri, 21 Feb 2014 18:15:49 +0000

On 02/21/2014 02:28 PM, mcmasters wrote:
> I think uniq -D -c may be meaningful when used in conjuction with -f
> Specifically, I wanted to use uniq -D -c -f 1 to find lines that are
> identical with respect to field 2 (-f 1), get a listing of how many times
> they occur (-c), but not throw away the differences in field 1 (-D)
> Is there a way to do that with uniq?

So given:

a v1
b v2
c v2

you want output like this?

2 b v2
2 c v2

It's unusual to repeat counts like that,
and uniq doesn't support that at present.

Could you expand on the use case perhaps?

thanks,
Pádraig.

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: mcmasters <daniel_mcmasters <at> merck.com>
To: Bug-coreutils <at> gnu.org
Subject: Re: bug#16831: don't say uniq -D -c is meaningless
Date: Tue, 25 Feb 2014 10:54:46 -0800 (PST)

It was a very specific computational chemistry use, and I went ahead and
wrote a short Perl script to get what I wanted. If this is an unusual
request I can certainly live without it.
Thanks, I'm a big uniq fan!



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Message #14 received at 16831 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: mcmasters <daniel_mcmasters <at> merck.com>
Cc: 16831 <at> debbugs.gnu.org
Subject: Re: bug#16831: don't say uniq -D -c is meaningless
Date: Wed, 19 Mar 2014 16:49:08 +0000

tag 16831 wontfix
close 16831
stop

On 02/25/2014 06:54 PM, mcmasters wrote:
> It was a very specific computational chemistry use, and I went ahead and
> wrote a short Perl script to get what I wanted. If this is an unusual
> request I can certainly live without it.
> Thanks, I'm a big uniq fan!

Since this is an unusual case and
would require different memory and processing complexity to implement,
I'm closing at this time.

thanks,
Pádraig.

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