How to Erase Terminal Commands

[ezhu]

The other day, I attempted to install Ruby with Terminal, but must have done something wrong because things didn't turn out correctly. How can I erase my attempts? I'm using a Macbook Pro Early 2013, Version 10.9.2.

And while I'm at it, what's the best/easiest way I can install Ruby?

Thank you in advance!

 

[Intell]

rm ~/.bash_history

Will remove your history, but it won't undo things you did with Terminal.