1. Check
Check if you have a local gem:
gem list –local builder
Check if there’s a remote gem:
gem list –remote builder
2. Install
e.g. for the Builder gem
gem install builder
Note, –no-rdoc avoids installing docs.
3. Enable
ruby -rubygems script.rb
or
export RUBYOPT=rubygems
4. Get Help
gem help
5. Run the Gem server
gem server
6. Remove Gems
gem uninstall rails
7. Other useful Gem commands
gem update
– updates all currently installed gems to their latest versions
gem env [option]
– shows RubyGems Environment information
gem spec gemname
– shows GemSpec data for a particular gem
http://onestepback.org/articles/rubygemsfacets/demousingagemlibrary.html