From: Maurits van Rees <maurits@vanrees.org>
Somewhat related: with CONTROL-R you can search backwards in your history when on the command line. It can be quite a time saver. I think that's only when you're in emacs-compatible mode.
This is a feature of bash. Someone with more knowledge of the various shells could probably elaborate more on this topic.
-- (Mr.) Gayle Lee Fairless Linux Gcomm 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i686 unknown