How to install ruby on linux server?

■ Requirement : Install ruby on linux system
■ OS Environment : Linux(RHEL, Centos)
■ Implementation Steps : 

$ cd /usr/local/src
$ Download latest tar ball of ruby
$ tar xvzf ruby-XXX.tar.gz
$ cd ruby-XXX
$ ./configure
$ make
$ make install
$ ruby rubytest.rb