RubyGems User Guide | RubyGems Manuals

Get it from RubyForge (http://rubyforge.org/frs/?group_id=126) and run (as root, if appropriate and necessary) ruby setup.rb It’s easy. It installs the required library files and the gem command. This command gives us the power to do everything else in this document, except distribute gems (for now!). Debian Linux: Debian does not automatically include all the standard Ruby libararies in the basic

[h6n]

「This means that on Ruby 1.9 and above, you will not need to require 'rubygems' in order to load gem libraries.」

[yuki_2021]

RubyGemsのインストール方法

[ysano2005]

3.2 Installing RubyGems in a User Directory