"You can execute a shell command on a remote system on which
you have an account without having to telnet in or start an
interactive shell of any kind. The command in question is rsh.
In order for rsh to work, you must have an ~/.rhosts file on the
remote machine containing the name of the machine you're calling
rsh from. Once this file is present, you can execute remote
commands on the system just like this:
$ rsh remote-host command"
"Note that in order for the commands above to work as shown, your
account on the remote system must have the same login name as the
account on the local system. If the logins differ, use the '-l'
argument to specify a username."
"Using rsh or ssh can make life much easier when working
intensely between two systems for short bursts of time."