randomcowsay.sh Like cowsay (wrapper) but randomizes the animal. Randomization code is from http://rosettacode.org/wiki/Pick_random_element#Bash

gistfile1.sh

#!/bin/bash

rand() {
    printf $((  $1 *  RANDOM  / 32767   ))
}
rand_element () {
    local -a th=("$@")
    unset th[0]
    printf $'%s\n' "${th[$(($(rand "${#th[*]}")+1))]}"
}
ANIMAL=$(rand_element `cowsay -l | grep -v files`)
cowsay -f $ANIMAL $@