GNU bug report logs - #13032
24.3.50; Request: Provide a `delete-duplicate-lines' command

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Message #35 received at 13032 <at> debbugs.gnu.org (full text, mbox):

From: Dani Moncayo <dmoncayo <at> gmail.com>
To: Juri Linkov <juri <at> jurta.org>
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 13032 <at> debbugs.gnu.org
Subject: Re: bug#13032: 24.3.50;
	Request: Provide a `delete-duplicate-lines' command
Date: Fri, 30 Nov 2012 08:51:34 +0100

>>>   C-u M-| awk -- '!a[$0]++' RET
>>
>> Isn't
>>
>>   C-u M-| uniq RET
>>
>> shorter and easier to type?
>
> I use `uniq' only on files where lines are sorted.  OTOH, something like
> '!a[$0]++' that is not limited to consecutive duplicates is better for
> files where lines are not sorted such as log files, etc.

My use cases usually involves compacting a collection of lines
gathered from several places.  So the compacting operation is normally
coupled with a sort operation.

Thus, the command provided by Juanma is good enough for these use
cases (I first do a `sort-lines' and then a `delete-duplicate-lines').

But I agree that it would be even better if `delete-duplicate-lines'
did TRT even when the lines are not sorted.  (I've just tested this
feature in MS-Excel, and it is so: it doesn't requires that the lines
are previously sorted)

Thank you.

-- 
Dani Moncayo

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