UBUNTU COMMAND LINE INTRODUCTION
https://tutorials.ubuntu.com/tutorial/command-line-for-beginners#0
Linux tutorials
http://www.ee.surrey.ac.uk/Teaching/Unix/
https://www.linux.org/forums/#linux-tutorials.122
Unix and Linux commands
http://www.computerhope.com/unix.htm
Shell scripting
http://www.freeos.com/guides/lsst/index.html