Php Exec

[webmaster1721]

Does anyone know why the following script will not rebuild one of my sendmail databases?

<?
exec('/usr/sbin/makemap hash /etc/mail/virtusertable.db < /etc/mail/virtusertable');
exit;
?>

[Frag]

permissions maybe?

[webmaster1721]

Yea, I tried that...just as a test I CHMOD'd both files to 777. No luck.