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There are dozens of ways to generate random numbers on *nix systems, for cryptograpic or other uses. Sometimes, you just want a simple integer between a certain range for use in a script.
The BSDs have long had the jot command, which can be employed for this task. For example, to return a random integer between 5 and 100:
% jot -r 1 5 100
The BSDs come with jot, because they're awesome. Linux users can install athena-jot.
Today though I also learned GNU shuf can be used for the same task on Linux and Solaris 11.
$ shuf -n 1 -i 5-100
For absolutely no reason whatsoever, have this string of numbers that shuf generated.
34 74 86 22 95 14 78 4