thoughtbot/trail-map — pull request #130 by JoelQ (2013-05-24 13:07:58+00:00)
Title: [JQ] Add a shell tutorial to UNIX trail

http://www.linuxcommand.org/lc3_learning_the_shell.php

It covers:
* Navigating the file system
* File permissions
* Manipulating the file system
* Shell commands
* I/O Redirection
* Expansion
* Permissions
* Job control