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shuf

Generate random permutations. More information: https://www.gnu.org/software/coreutils/shuf.

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

shuf {{filename}}

Only output the first 5 entries of the result:

shuf --head-count={{5}} {{filename}}

Write the output to another file:

shuf {{filename}} --output={{output_filename}}

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

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