instead of using $RANDOM, which isn't POSIX, we get even more esoteric by pulling 2 bytes from /dev/urandom, giving them to od which turns them into unsigned decimals, and then we bitshift the output, either by 5 or 6 depending on if we are replacing $RANDOM/1000*60 (right sift by 5 is the same as dividing by 2^N, or /32) or $RANDOM/2000*60 (range of [0,983])

Thanks to dkg for working through this with me, not only did he come up with it faster than a human brain should be able to function, he had the patience to explain all the individual pieces that I did not understand to me.

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