rushrush 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. Previously if you wanted to count the number of classes in your project, you might use a bash command like:
Emacs 上で快適に Bash や Zsh を利用する設定 : 紹介マニア
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