Pádraig Brady wrote:
> Jim Meyering wrote:
>> Pádraig Brady wrote:
>>> Also it's quite easy to achieve with existing tools:
>>> awk '{print length, $0}' <file | sort -n | cut -f2- -d' '
>> IMHO, this is a decisive argument for not adding the option.
>> However, I would welcome a paragraph documenting the technique as
>> an example of how to extend sort.
>
> I'll mention the DSU idiom in the info docs,
> with this as an example.
attached
>From 48d9b15477de1b6b53857642bc7c4aba0ccf9d67 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?P=C3=A1draig=20Brady?= <[email protected]>
Date: Sat, 25 Jul 2009 00:46:12 +0100
Subject: [PATCH] doc: add a sort by line length example to sort info
* doc/coreutils.texi (sort invocation): Add an example showing how
to sort data not directly supported by the sort command.
---
doc/coreutils.texi | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 4599a27..f1072a9 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -4258,6 +4258,17 @@ by the sort operation.
@c @end example
@item
+Use the common @acronym{DSU, Decorate Sort Undecorate} idiom to
+sort lines according to their length.
+
+...@example
+awk '@{print length, $...@}' </etc/passwd | sort -n | cut -f2- -d' '
+...@end example
+
+In general this technique can be used to sort data that the @command{sort}
+command does not support directly.
+
+...@item
Shuffle a list of directories, but preserve the order of files within
each directory. For instance, one could use this to generate a music
playlist in which albums are shuffled but the songs of each album are
--
1.6.2.5
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