GNU bug report logs - #10287
[wishlist] uniq can remove non adjacent lines

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pádraig Brady <P <at> draigBrady.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#10287: closed ([wishlist] uniq can remove non adjacent lines)
Date: Tue, 13 Dec 2011 08:47:02 +0000

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Your message dated Tue, 13 Dec 2011 08:45:24 +0000
with message-id <4EE710A4.2030104 <at> draigBrady.com>
and subject line Re: bug#10287: [wishlist] uniq can remove non adjacent lines
has caused the debbugs.gnu.org bug report #10287,
regarding [wishlist] uniq can remove non adjacent lines
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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From: Stéphane Blondon <stephane.blondon <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: [wishlist] uniq can remove non adjacent lines
Date: Mon, 12 Dec 2011 23:54:57 +0100

Tool: uniq
Priority: wishlist

Hello,

I think `uniq` should have an additional option (for example -a,
--all) to remove same lines but not adjacent.

The man page explains a workaround based on `sort` but it can be
complex to use. Few weeks ago, I had to `uniq`-ize random numbers and
the sort couldn't really work. Fortunately, the order was not
important so using `sort | uniq | sort --random-sort` was an
acceptable solution. I imagine cases based on other tools like `top`
could be a problem too.

If you are interested, I could try to provide a patch. (I have learnt
C but I don't use it today.)

I don't think the increase of memory use is a problem today, so a
warning in the manpage should be enought.


Thank for all,
-- 
Stéphane

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From: Pádraig Brady <P <at> draigBrady.com>
To: Stéphane Blondon <stephane.blondon <at> gmail.com>
Cc: 10287-done <at> debbugs.gnu.org
Subject: Re: bug#10287: [wishlist] uniq can remove non adjacent lines
Date: Tue, 13 Dec 2011 08:45:24 +0000

On 12/12/2011 10:54 PM, Stéphane Blondon wrote:
> Tool: uniq
> Priority: wishlist
> 
> Hello,
> 
> I think `uniq` should have an additional option (for example -a,
> --all) to remove same lines but not adjacent.
> 
> The man page explains a workaround based on `sort` but it can be
> complex to use. Few weeks ago, I had to `uniq`-ize random numbers and
> the sort couldn't really work. Fortunately, the order was not
> important so using `sort | uniq | sort --random-sort` was an
> acceptable solution. I imagine cases based on other tools like `top`
> could be a problem too.
> 
> If you are interested, I could try to provide a patch. (I have learnt
> C but I don't use it today.)
> 
> I don't think the increase of memory use is a problem today, so a
> warning in the manpage should be enought.

Well that would increase the complexity of `uniq` a _lot_
http://lists.gnu.org/archive/html/coreutils/2011-11/msg00018.html
For that reason I would be against adding such a feature.
Note improving the field selection of `uniq` is appropriate,
and would make DSU solutions using sort, easier to implement.

cheers,
Pádraig.

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