ruby-shell

https://github.com/isene/rsh

A shell written in Ruby with extensive tab completions, aliases/nicks, history, syntax highlighting, theming, auto-cd, auto-opening files and more. In continual development. New in 2.0: Full rewrite of tab completion engine. Lots of other bug fixes. 2.6: Handling line longer than terminal width. 2.6.2: Fixed issue with tabbing at bottom of screen.