A Unix Shell in Ruby A series of articles on creating a unix shell in Ruby by Jesse Storimer Part 1: A Unix Shell in Ruby 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