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If you need to randomize the lines in a file, but have an old sort commands that doesn't support the -R option, this could be helpful. It's easy enough to remember so that you can create it as a script and use that.
It ain't real fast. It ain't safe. It ain't super random. Do not use it on untrusted data. It requires bash for the $RANDOM variable to work.
There is 1 alternative - vote for the best!
Seeing that _sort_ its been used, why not just _use_ it. ;)
If you can do better, submit your command here.
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