Shirt
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Shirt is a simple Unix shell written in pure Ruby. It takes inspiration from bash and is written mostly for educational purposes.

It was written over a series of blog posts on http://jstorimer.com.

Links
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* Part 1 - http://jstorimer.com/2012/02/16/a-unix-shell-in-ruby.html
* Part 2: Builtins - http://jstorimer.com/2012/02/21/a-unix-shell-in-ruby-builtins.html
* Part 3: A Login Shell and the PATH - http://jstorimer.com/2012/03/10/a-unix-shell-in-ruby-search-path.html