The Free On-line Dictionary of Computing (19 January 2023):

rc

   1.  run commands.

   2. A shell from AT&T's Plan 9, by Tom Duff.  rc offers
   much the same capabilities as a traditional Bourne shell,
   but with a much cleaner syntax.

   An open source reimplementation was made by Byron Rakitzis,
   and is now maintained by Tim Goodwin .

   (http://star.le.ac.uk/~tjg/rc).

   (2000-06-17)