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.
The version of shuf bundled in GNU coreutils was written by Paul Eggert. It is not a part of POSIX.[1]
shuf
$ ls Wikibooks Wikipedia Wiktionary $ # Shuffles input $ ls | shuf Wikipedia Wiktionary Wikibooks $ # Picks one random line from input $ ls | shuf -n1 Wikipedia
shuf(1)
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