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bug#10287: [wishlist] uniq can remove non adjacent lines

From: Pádraig Brady
Subject: bug#10287: [wishlist] uniq can remove non adjacent lines
Date: Tue, 13 Dec 2011 08:45:24 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0

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_
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.


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