php -q /home/username/public_html/x_y_z.php.

<?php

ob_start();

/* >>> your existing php code goes there */

$output = ob_get_contents();
ob_end_clean();

/* the text to be mailed is now in variable $output */

mail("reciptient@host.com", "Mail from cron job" , $output, "From: Webmaster <webmaster@example.com>rnReply-To: webmaster@example.com");

?>

sudo vi /etc/mailname