GNU bug report logs - #20725
Shuf problem

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From: Stephane Chazelas <stephane.chazelas <at> gmail.com>
To: 20725 <at> debbugs.gnu.org
Subject: bug#20725: Shuf problem
Date: Wed, 3 Jun 2015 14:58:58 +0100

2015-06-03 14:33:35 +0100, Pádraig Brady:
> On 03/06/15 14:20, Federico Alves wrote:
> > I think that shuf should have an option, may set ON by default, to avoid empty lines in a file when shuffling it. if a file has 100 lines and ten are simply returns, 99% of the time I do not want an empty line, I want only the real lines.
> 
> We would only consider that if it provided functional benefits
> or large performance gains.  Neither would be the case here I think
> compared to some simple preprocessing like:
> 
>  sed '/^$/d' | shuf
[...]

Or 

grep -v '^$' | shuf

or

grep . | shuf

(that one will also exclude lines that contain sequences of
bytes that don't form any valid characters).

-- 
Stephane

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