Shuf

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shuf is a command-line utility included in the textutils package of GNU Core Utilities for creating a standard output consisting of random permutations of the input:

$ ls
Wikibooks  Wikipedia  Wiktionary
$ # Shuffles input 
$ ls | shuf 
Wikipedia
Wiktionary
Wikibooks
$ # Picks one random line from input
$ ls | shuf -n1
Wikipedia

See also[edit]