exec, system , backtick

Hello, Im running PHP 4.0.6 on Red Hat 7.2 I tried a simple command line script, in all cases no_file does not exist. I do not want the command line script to show the error on the screen but to deliver it in the variable $r. But alas, in all 3 cases i get 'rm: canoot remove `no_file': No such file or directory' #! /usr/bin/php -q <? $r = rm no_file; \\ or $r = system("rm no_file") or exec("rm no_file"); echo "the value in r is $r"; ?> What should i do ? thank you gamin.