#!/bin/bash
chars=( 1 2 3 4 5 6 7 8 9 0 )
let  kcode=10
num_chars=${#chars[*]}
while [ $num_chars -gt 0 ]
do
NUM=$((RANDOM%num_chars))
KEY=${chars[${NUM}]}
xmodmap -e "keycode $kcode = $KEY"
chars=(${chars[@]:0:$NUM} ${chars[@]:$(($NUM + 1))})
num_chars=${#chars[*]}
let kcode++
done