use gem which.
$ gem which rack
/Users/sugyan/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack.rb
More than 5 years have passed since last update.
Register as a new user and use Qiita more conveniently
- You get articles that match your needs
- You can efficiently read back useful information
- You can use dark theme