Exec submits prog 2 times !!!

Hi all, I need to execute a command that will remotely exec another one on another server. Here is the code (really simple) : print "Launching ssh<br>"; flush(); $pgm = "ssh -fnl oracle diamond \"/home/oracle/myprog.sh &\" >/dev/null 2>/dev/null"; exec ($pgm, $output, $res); The ssh ... goes well when launched under shell and everything works fine BUT when launched through the browser, I have only one message (Launching ssh) but the prog executes 2 times. Any idea will be aapriciated. Thanks to all !