php exec() problems

[Phillis]

i am having this problem for 2 days and didn`t found an answer to it yet.
here is my bit of code

<?php
echo '<pre>';
echo exec('whoami') or die("It doesn't work");
echo '</pre>';
?>

when i try to run this page(test2.php) from web i get
It doesn't work
i tried with other commands but still nothing.
how to fix it please..

[bornonline]

is that PHP function (exec) disabled in PHP.ini disable_functions = ?

[Phillis]

no its not disabled

[anton_latvia]

Are you sure it's not disabled? Well, check out that "/usr/bin/whoami" is not disabled and that safe mode has not been enabled as well.

Anton.

[Phillis]

i forgot to post..its been fixed
aparently it was enabled in Plesk
thanks for the replyes guys