gem install rvm の めも

$ sudo gem install rvm
Password:

*******************************************************************************

This gem contains only the Ruby libraries for the RVM Ruby API.

In order to install RVM please use one of the methods listed in the documentation

http://rvm.beginrescueend.com/rvm/install/

such as,

bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-latest )

followed by placing the sourcing line in your ~/.bash_profile or wherever may
be appropriate for your setup (example, .zshenv, /etc/profile, ...):

-s "$HOME/.rvm/scripts/rvm" && . "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*

After completing setup please open a new shell to use RVM and be sure to run
'rvm notes' to gain a list of dependencies to install before installing the
first Ruby. You can read more details about this process on the above
mentioned install page as well as the basics page:

http://rvm.beginrescueend.com/rvm/basics/

Enjoy!

~Wayne

*******************************************************************************

Successfully installed rvm-1.1.6
1 gem installed
Installing ri documentation for rvm-1.1.6...
Installing RDoc documentation for rvm-1.1.6...