bug#5587: should have sort --unique function

[Lars Ingebrigtsen]

jidanni@jidanni.org writes:

> sort.el doesn't seem to have any sort --unique functionality.
>
> One needs to use
> C-u M-x shell-command-on-region "sort -u"
>
> Well, might as well use sort(1) for everything then...

There's `delete-duplicate-lines' that can be used to post-process the
output of `sort-lines' (etc), so I don't think sort.el needs to support
a -u thing, and I'm closing this bug report.

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   bloggy blog: http://lars.ingebrigtsen.no