#!/bin/bash
#Criado por Pedro R. Limeira - Podem usar a vontade.

if [ "${1}" = "--help" ]; then
  echo "Usage: ./randompass <number of caracters>"
elif [ "${1}" = "" ]; then
  echo "Usage: ./randompass <number of caracters>"
else
  a=`tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${1}`
  echo $a
fi