Ruby Programming Language: Basic Ruby command

We have learned how to run Ruby on cmd.exe on Windows

So let's learn some Ruby.

Concise Ruby Language Tutorial 
A short, but quite enough tutorial for beginners. But we don't spend too much time going through every chapter here, because our goal is to learn data-mining, not Ruby. We can review it when we need it.


Quick Note
 
A quick overview of the most basic commands, in case we forgot.