System Call/Script Troubles

[Michael Stearne]

I am having the strangest problem using system() or exec() or any
variation.  None of them work on the Fedora Core 3 system that was
just loaded.  The PHP is Version 4.3.11 with Apache 2.0.52, the default
installation for Fedora Core 3.  Everything in PHP works as expected
except when trying a system call.  If I run :

<?
system("/bin/ls /tmp");
?>

on my OS X (Apache/1.3.33 (Darwin) PHP/4.3.4) this returns the desired
results, a listing of the tmp directory.  On the Fedora box I get
nothing, a blank page.  There is content in the /tmp directory on the
Fedora box.

It also seems that I can't even run a shell script in the
/var/www/html directory even from the command line?  Does anyone know
what this restriction is about?

Please help!