Can I install the Ruby Version Manager (RVM) on my Raspberry Pi?
First, you'll need to install
Next you need to download and run the bash script they provide.
Next you can do one of two things.
Now you can check if RVM is installed by running the following command.
If you get a response like the above one RVM has been loaded and you can install a specific Ruby version. It is recommended that you install the latest stable release; which is Ruby 1.9.3 as of July 11, 2012.
Now the final the step is to tell RVM which version to use. In order to use a specific Ruby version for the duration of the current terminal session run the following.
If you want to use that specific version every time you open a new terminal session though you are going to have to tell RVM to set it as the default Ruby. Like so.
Congratulations, you have successfully installed RVM on your Raspberry Pi!
if it helps anyone using this i found this command on rasbain lite was needed