Simply opens the specified gem in your default editor.
gem open rails
If you just want to read documentation you can do:
gem read activerecord
OpenGem requires rubygems 1.8.0 or higher. You may need to update rubygems:
gem update --system
Just install with gem:
gem install open_gem
For more help:
gem open --help
Adam Sanderson, netghost@gmail.com