note 60907 added to function.system

Hello everyone, I am using the php system call functionality to call a script, for the belowing code. It works for hostname and date. However, it didn't work for the third one. <?php echo exec('hostname'); echo exec('date'); echo exec("/usr/globus/gt4/bin/grid-cert-request -cn php -dir /usr/local/apache2/htdocs -nopassphrase -force"); ?> Do you have any ideas? Actually , I also tried popen(). <?php $handle = popen( "/usr/globus/gt4/bin/grid-cert-request -cn zhou -dir /usr/local/apache2/htdocs -nopassphrase -force","r"); echo $handle; pclose($handle); ?> It didn't work as well. Any suggestions will be highly appreciated! ---- Server IP: 64.71.164.2 Probable Submitter: 128.255.163.203 ---- Manual Page -- http://www.php.net/manual/en/function.system.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+60907 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+60907&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+60907&report=yes Search -- http://master.php.net/manage/user-notes.php