shuf

Generate random permutations. More information: https://www.gnu.org/software/coreutils/manual/html_node/shuf-invocation.html.

• Randomize the order of lines in a file and output the result:

shuf path/to/file

• Only output the first 5 entries of the result:

shuf --head-count=5 path/to/file

• Write the output to another file:

shuf path/to/input_file --output=path/to/output_file

• Generate 3 random numbers in the range 1-10 (inclusive):

shuf --head-count=3 --input-range=1-10 --repeat