rush is a replacement for the unix shell (bash, zsh, etc) which uses pure Ruby syntax. Grep through files, find and kill processes, copy files - everything you do in the shell, now in Ruby.
Well, why not? Immerse yourself in Ruby 24x7. Dive into it so deeply your fingers forget tab completion or the funny way that csh uses vi keystrokes. Get into that sucker, do a zen thing and snuggle right up to the machine.
rush> myrails = home['rails/']