export database without phpmyadmin

Hi! sometimes you need to get database, but you haven't phpmyadmin/sqladminer nor or you just want to do it faster.
So you can do it loggining via ssh and use some mysql command or create script with

<?php
exec('mysqldump --user=MYUSERNAME --password=MYPASSWORD --host=localhost MYDATABASENAME > backup.sql');
exit('done');

and run it