Installation

Ruby can be downloaded here.

For further information on how to install Ruby on your operating system, read here.

Alternatively you can use RubyInstaller on Windows and rbenv and rvm on Unix & OSx.

Gem

Gem is a command-line tool interfacing with RubyGems, the package manager for the Ruby Programming language that provides a standard format for distributing Ruby programs and libraries (in a self-contained format called a "gem").

Install Gem

To download and install Gem, follow the instructions here.