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Basic Syntax
If you've already installed RVM, you should have the rvm command available to you. This is the way we call RVM.

The basic syntax of the command is:

rvm command_options command ruby_to_act_on
There are also RVM flags that can alter the behavior of RVM, which are given in a similar way to command options.

You can get a list of the available commands by typing:

rvm help
If you would like help on a specific command, you can reference it after "help" to get more detailed instruction:

rvm help command

Video guide: https://www.youtube.com/watch?v=cQVb7fHFjSM

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Setting the default Ruby

If you would like to make one specific Ruby be the default ruby that is selected when you open a new terminal shell, use the --default flag:

$ rvm --default use 2.1.1

$ ruby -v

ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin12.0]
The next time you open a window Ruby 2.1.1 will be the selected ruby.

To switch back to your system ruby:

$ rvm use system

$ ruby -v

ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]
To switch at any time to the ruby you have selected as default:

$ rvm default

$ ruby -v

ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin12.0]
To show what ruby is currently the selected default, if any, do:

$ rvm list

rvm rubies

 * ruby-1.9.3-p484 [ x86_64 ]
   ruby-2.0.0-p481 [ x86_64 ]
=> ruby-2.1.1 [ x86_64 ]

# => - current
# =* - current && default
#  * - default