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").{Unix FAQ (http://www.cis.ohio-state.edu/hypertext/faq/usenet/unix-faq/faq/top.html)}.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 .Latest version: 1.6, as of 2000-06-15.Start .(2000-06-17)