Simple bash script that logs user into desired website

weblogin.sh

#!/usr/bin/env bash

help_message() {
echo "Usage: $0 'username' 'password' 'https://urltologin.com'"
}

if [ -z $1 ] 
then
	help_message
	exit 2
fi

if [ -z $2 ]
then
	help_message
	exit 2
fi

if [ -z $3 ]
then
	help_message
	exit 2
fi


curl --user "$1":"$2" "$3" -v 
exit 0