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enter code hereThis is a one liner to randomize STDIN, the aim is to feed a list of files and tail -N gives you N random out of a huge list (bigger than N anyway):

 ruby -e 'arr=[]; ARGF.each {|line| arr << line}; puts arr.sort_by {rand}'

I am wondering if there is a shorter version.

The winner is:

find . -type f | ruby -e 'puts ARGF.sort_by {rand}'
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3 Answers 3

Reset to default
3

How about:

ruby -e 'puts ARGF.sort_by{rand}'
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3 Comments

It does not seem to work... "e:1:in each_line': private method rand' called for "./""
you mean: ruby -e 'puts ARGF.sort_by {rand}' and yes! :)
Sounds like a Ruby version conflict, the &:rand syntax works for me but your {rand} version is the same thing and even uses 2 fewer characters (if you get rid of that space :).
1

This what you're looking for?

ruby -e 'p ARGF.to_a.sample'
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I need to randomize a list what I get on STDIN, see example above
0

Who needs stdin?

Dir["*"].select {|v| v if File.file?(v)}.sort_by {rand}
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