The rc shell
rc is a shell designed by Tom Duff to replace the venerable
Bourne shell in Plan 9. It provides similar facilities to sh,
with some small additions and mostly less idiosyncratic
syntax. There is a free reimplementation done by Byron
Rakitzis, which is what I use and what most people talk about.
See the
rc FAQ
for more details; get it from rtfm.mit.edu as
/pub/usenet/comp.unix.shell/rc-FAQ.
Send subscription requests for the rc mailing list to the address
rc-request at hawkwind.utcs.utoronto.ca.