V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

RSH
       Restricted SHell (Unix, Shell)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

RSH
       Remote SHell (Unix, BSD, Shell)


The Free On-line Dictionary of Computing (30 December 2018):

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)