Source : Free On-Line Dictionary of Computing

rsh
     
        Remote shell.
     
        A {Berkeley Unix} networking command to execute a given
        command on a remote {host}, passing it input and receiving its
        output.  Rsh communicates with a {daemon} on the remote host.
        It is sometimes called remsh to avoid confusion with the
        {restricted shell}, also called "rsh".
     
        {Unix manual page}: rsh(1).
     
        (1994-12-08)