1. (run commands) The filename extension common to many unix configuration files, e.g. .newsrc, .cshrc, .twmrc, elmrc, etc.
The suffix "rc" derives from a script-creation utility in ctss called "runcom" (for "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 <firstname.lastname@example.org>.
Latest version: 1.6, as of 2000-06-15.