Generate random strings

genrand.sh

#!/bin/bash

usage() {
  echo "Usage: `basename $0` [length]"
}

[ $# -gt 1 ] && usage && exit 65

[ $# -eq 0 ] && len=8 || len=$1

strings /dev/urandom | grep -o '[[:alnum:]]' | head -n $len | tr -d '\n'; echo