Bash-password-genorator

Bash version

#!/bin/bash
if [[ -z $1 ]]; then
  CHAR=10
else
  CHAR=$1
fi
strings /dev/urandom | grep -o '[[:alnum:]]' | head -n ${CHAR} | tr -d '\n'; echo '!'

Shell version

#!/bin/sh
if [ -z $1 ]; then
  CHAR=10
else
  CHAR=$1
fi
strings /dev/urandom | grep -o '[[:alnum:]]' | head -n ${CHAR} | tr -d '\n'; echo '!'