On Oct 3, 2:55     
> hello,
> total mac newby here. i'm traying to install ruby via rvm but i'm not
> having much success. git is already installed. What I do:
>

How you installed git? It is available in the PATH? (which git)

Also check the prerequisites page of RVM:

http://rvm.beginrescueend.com/rvm/prerequisites/

A working Xcode installation also is needed.

--
Luis Lavena