GNU/Linux CentOS RVM Manage Multiples Rubies Versions Guide
RVM Multiple Ruby Version Management on CentOS
Hi! The Guide shows you Step-by-Step How to Getting-Started with RVM to Install and Manage Multiples Ruby Versions on CentOS GNU/Linux.
And RVM for CentOS is a Command-line Tool which allows you to easily Install, Manage, and Work with Multiple Ruby Environments (Interpreters to sets of Gems).
If RVM is Not Already Installed you Find included Link to Guide on Installing RVM on CentOS.

1. Launching Terminal
Open a Terminal Shell Emulator Window:
(Press “Enter” to Execute Commands).