How to hide system() return value

Sorry guys,I have a problem. I call an exetrnal file within my page using system() function and that file actually
return the string result after it is called. So then,how do i hide the string or destroy it because i don't want the
user get confused with that string.

Anyone,please help me!!

I figure it out guys. Use ob_start and ob_end_clean between codes that call system function.

ob_start();
system($sys);
ob_end_clean();

It delete all the the string that return after system function has been called.It works perfectly!