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Re: Feature Request for 'sort' utility

From: Pádraig Brady
Subject: Re: Feature Request for 'sort' utility
Date: Mon, 27 Jun 2011 15:34:01 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

On 27/06/11 13:53, Eric Blake wrote:
> On 06/26/2011 06:05 PM, Bob Proulx wrote:
>> scott n-h wrote:
>>> -I or --ip-address
>>> I'm hoping the usefulness of this would be apparent.
>> The coreutils manual:
>> Shows an example of sorting IPv4 addresses this way:
>>   sort -s -t. -k 1,1n -k 2,2n -k 3,3n -k 4,4n
> However, there's no easy way to sort IPv6 addresses using existing sort
> keys, so maybe there is indeed room for improvement, if someone would
> care to contribute code.

Well the argument here is whether IP addresses are
a fundamental enough type to support directly within sort,
or whether using the Decorate Sort Undecorate pattern is more appropriate.

Here is an example of using DSU with funcpy¹
which handles the various formats IPV6 addresses can be in:

printf '%s\n' ::03 ::2 ::1 |
funcpy --import socket,struct "
':'.join('%04x' % x for x in
" | sort | cut -f2-

While being more general, this is fairly awkward.
Also there is a binary to ascii step that would
not be required if done internally.
I guess if we were supporting this we'd use the 'I' option.
I'm 50:50 on adding this though, as I'm not
sure how common it is to need to sort IP addresses?



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