bug#19896: 23.1; reverse-region is slow compared to sort-columns

[Eli Zaretskii]

> From: Ivan Shmakov <ivan@siamics.net>
> Date: Wed, 18 Feb 2015 18:29:08 +0000
> 
>  > A workaround on linux: use 'C-u M-x shell-command-on-region' with tac
>  > (the opposite of cat) instead of using 'M-x reverse-region'.
> 
>       On a GNU system (as well as on any other system featuring
>       GNU Coreutils), it should be possible to just use sort(1) for
>       the purpose.  For instance, the “reverse” option is ‘-r’.

But sort(1)'s sort order is locale-specific, whereas that of Emacs
isn't.