[PHP] system command?

[Jas]

Anyone know what this wouldn't work?  I have tried using a couple of 
functions defined at http://us2.php.net/manual/en/ref.exec.php and none 
seem to have the desired effect.

<?php
$tailed = shell_exec('tail -f /path/to/log');
//$tailed = exec('tail -f /path/to/log');
//$tailed = system('tail -f /path/to/log');
print = "<textarea>$tailed</textarea>";
?>
Thanks in advance,
Jas
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