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shuf is in the coreutils package
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This appends a random number as a first filed of all lines in SOMEFILE then sorts by the first column and finally cuts of the random numbers.
Works in sort (GNU coreutils) 7.4, don't know when it was implemented but sometime the last 6 years.
Seeing that _sort_ its been used, why not just _use_ it. ;)
If you can do better, submit your command here.
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