shuf(1) - generate random permutations
-e, --echo
       treat each ARG as an input line
-i, --input-range=LO-HI
       treat each number LO through HI as an input line
-n, --head-count=COUNT
       output at most COUNT lines
-o, --output=FILE
       write result to FILE instead of standard output
       get random bytes from FILE
-z, --zero-terminated
       end lines with 0 byte, not newline
--help display this help and exit
       output version information and exit