how to run 'rsh' command from php

[prasannaforu]

hi friends,
i am not able to run rsh command from php. is anybody help me? my code is:

system("rsh -n -l username machine_name perl perl_script.pl input_file > output_file");
is there anything wrong in this code? or suggest me a better code.
thanks in advance,
Prasanna

[jansky]

do you have privilidge to access rsh from the server?
try exec(which rsh);