Simple password generator

password_gen

#! /bin/sh

while getopts hn: flag
do
    case "${flag}" in
        n) length=${OPTARG};;
        h) echo "-n for the number of random characters, -h for help"; exit 0;;
    esac
done

base64 < /dev/random | head -c 1000 |  sed 's/\+//g' | sed 's/\///g' | head -c $length | xargs echo