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.


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