Bash Crash is an online course, outlined  in several documents, that I wrote, and teach. It goes from simple to complex bash shell uses and examples. It can be downloaded and repeated at your own speed. It have been translated into two other langueges, but currently only appears online in english. There is a special emphasis on the not-so-obvious features and functionality of bash: job control, subshell behavior, local vs. global variable scope.For the /etc, I will, at the end of this class, give an Ubuntu file system overview. This Bash Crash is being trated as a prerequisite to the Ubuntu basics class. It is recommended that you attend this class if you will also be in the Ubuntu class.