What is “ruby-install” Package?

Install Ruby, JRuby, Rubinius, MagLev, or mruby
For more details: https://github.com/postmodern/ruby-install#readme

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install ruby-install.

  brew install ruby-install

Now, use ruby-install!