#!/bin/bash
#
# Random password generator
#

LENGTH=$1
SET=$2

[ "$LENGTH" == "" ] && LENGTH=14
[ "$SET" == "" ] && SET=1
[ $SET -gt 5 ] && SET=$((${SET}%5+1));

case $SET in
    1)  tr -cd '[:alnum:]' < /dev/urandom | head -c${LENGTH}; echo
        ;;
    2)  tr -cd '[:lower:]' < /dev/urandom | head -c${LENGTH}; echo
        ;;
    3)  tr -cd '[:lower:][:upper:]' < /dev/urandom | head -c${LENGTH}; echo
        ;;
    4)  tr -cd 'a-zA-Z0-9`~!@#$%^&*()[]{}_=+\;:/?.>,<|-' < /dev/urandom | head -c${LENGTH}; echo
        ;;
    5)  tr -cd '[:lower:][:digit:]=\][;/.,-' < /dev/urandom | head -c${LENGTH}; echo
        ;;
esac