How to look busy

busy.sh

#!/bin/bash
cleanup () {
	tput cnorm
	exit 0
}

clear
trap cleanup EXIT TERM
tput civis
while true; do
	head -c$[(`tput cols` / 25)*10*($RANDOM%10+1)] /dev/urandom | od -An -w$[(`tput cols` / 25)*10] -x | grep -E --color "([[:alpha:]][[:digit:]]){2}";
 sleep .$[$RANDOM % 10];
done