rc is a truly beautiful thing.

I wrote a pretty complex web framework and CMS with it ( http://werc.cat-v.org ), and the more I used it, the more I loved it.

I found it to be extremely well crafted, with every feature fitting beautifully with the rest, it misses many fancy things people expect, but once you know your way around what it has, you can do almost anything.

Like awk, is one of those few languages that you can fully keep in your head, and that plus the power of calling other Unix/Plan 9 commands makes it very effective.