My purpose is to provide you the set of basic commands with examples so that you can at least read the most of sample script you can get from here and there (e.g, internet) without overwhelming you. There are huge number of functions which has not been explained here, but I would try to list those functions which are most commonly used in most of matlab sample script you can get. I would try to list those commands that can work both with Matlab and Octave). I don't think it has 100% compatability between Octave and Matlab, but I noticed that most of basic commands are compatible. (Octave is a GNU program which is designed to provide a free tool that work like Matlab. In this page, I would post a quick reference for Matlab and Octave.
