RVM – Ruby Version Manager

RVM is a program that allows you to install and manage multiple versions of Ruby and Gems. This setup is ideal for testing your application or gem (library) against multiple versions of Ruby.Also, if you're looking into Rails 3 on Ruby 1.9 this is a great way to try it out.
Are you thinking about moving your application to Ruby 1.9? Do you have a gem or plugin you need to test in multiple Ruby versions?

RVM is your tool. It allows you to manage and install multiple Ruby versions and the gems installed under each version.
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