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!