I am testing the IPC::session module for feasibility of use. The test I am running is very simple. use IPC::Session; my $session = new IPC::Session("rsh xxx",30); my $rc=$session->send("/bin/hostname"); print $session->stdout(); print "RC $rc\n"; When I try to run this, the following error message presents. unable to determine remote shell I am running this on a SunOS xxx 5.8 Generic_108528-22 sun4u sparc SUNW,Sun-Fire-880 machine.