Use Gem - sinsunsan/archiref_wiki GitHub Wiki
Gem is a package manager for ruby
gem help to have a basic list of commands
gem help commands to have a more complete list of commands
gem list to list current gems installed on the machine
gem update compass Update one of the gems (compass : http://compass-style.org/ )
gem list -d compass Output information about a given gem
sudo gem uninstall compass --version 0.11.5 Uninstall a specific version of compass