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Subject: |
23.1; reverse-region is slow compared to sort-columns |
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Date: |
Wed, 18 Feb 2015 17:35:42 +0000 (UTC) |
The emacs manual recommends 'M-x reverse-region' as a companion to 'M-x
sort-columns' to achieve a descending-order column sort. However, for large
regions (>100k lines), 'M-x reverse-region' is noticeably slower than 'M-x
sort-columns', making descending sort much slower than ascending sort.
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'.
FROM THE MANUAL:
https://www.gnu.org/software/emacs/manual/html_node/emacs/Sorting.html
M-x reverse-region
Reverse the order of the lines in the region. This is useful for sorting
into descending order by fields or columns, since those sort commands do not
have a feature for doing that.
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--- Begin Message ---
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Subject: |
Re: bug#19896: Please modify documentation to close this bug |
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Date: |
Sat, 18 Apr 2015 20:49:10 -0400 |
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User-agent: |
Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) |
Version: 25.1
address@hidden wrote:
> Add the following to the description of M-x sort-columns:
> "A numeric argument means sort into descending order."
>
> Remove "or columns" from the description of M-x reverse-region.
Thanks; done in the source. (The versions on www.gnu.org will probably
not be updated until the next Emacs release.)
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