#!/bin/bash

LENGTH=30
CLASS="[:alnum:]-_.:,;*=!<>"

# Show usage
if [ "$1" == "--help" ]; then
	echo "Usage: $0 [length] [class]"
	echo "Default length: 30"
	echo "Default class: $CLASS (see 'man tr')"
	exit 0
fi

# Set length if given
if [ "$1" != "" ] && [ $1 -gt 0 ]; then
	LENGTH=$1
fi

shift

# Set class if given
if [ "$1" != "" ]; then
	CLASS=$1
fi


echo "Generating from /dev/urandom with length $LENGTH using class $CLASS."

PW=`cat /dev/urandom | tr -dc "$CLASS" | head -c $LENGTH`
echo "Generated password: $PW"
PW="XXXX"

exit 0