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#!/bin/bash
#
# Use this script to generate a random password in console/bash
#
# Example:
# ./genpass.sh 25 a
# Will generate a 25 character random password using only letters


if [ -z "$1" ]
  then
    echo "Please supply a password length"
    echo "i.e. 20 for 20 character password"
    echo "-----------"
    echo "./genpass.sh 20 a"
    echo "would be 20 char pass using letters and numbers"
    echo "-----------"
    echo "./genpass.sh 20 b"
    echo "would be 20 char pass using letters and numbers"
    echo "and special characters"
    exit 1
fi

if [ -z "$2" ]
  then
    echo "Please specify whether to use letters"
    echo "and numbers only, or letters with numbers"
    echo "and special characters"
    echo "------------"
    echo "./genpass.sh 20 a"
    echo "would be 20 char pass using letters and numbers"
    echo "------------"
    echo "./genpass.sh 20 b"
    echo "would be 20 char pass using letters and numbers"
    echo "and special characters"
    exit 1
fi

if [ $2 = "a" ]
then 
  # Letters and numbers only
  tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w "$1" | head -n 1
elif [ $2 = "b" ]
then
  # Letters, numbers, special characters
  tr -dc 'a-zA-Z0-9~!@#$%^&*_()+}{?></";.,[]=-' < /dev/urandom | fold -w "$1" | head -n 1
else
  echo "Wrong argument, second arg can only be a or b"
  exit 1
fi