Ask a password before launching a command

launch.sh

#!/bin/bash

hash=916f4c31aaa35d6b867dae9a7f54270d

while true
do
	echo -ne "\n~~ Ingrese contraseña y presiona ENTER (nada para Salir): "
	read -s pw
	if [ -z $pw ]; then
		echo
		exit 1
	fi

	sum=$(echo $pw | md5sum | cut -d' ' -f1)
	if [ $sum = $hash ];then
		break
	fi

done
echo
echo commando