title: "rails g controller welcome" not creating welcome_controller.rb
body: <p>when i excuite the command "rails g controller welcome" in iTerm on macpro(10.12), there did not create the file of app/controllers/welcome_controller.rb , it just show me "identical  app/controllers/welcome_controller.rb" ,just as the picture shows .
  and here is my github <a href="https://github.com/xiaoyiam/job-listing" rel="nofollow noreferrer">https://github.com/xiaoyiam/job-listing</a></p>
  
  <p>and here is the link of the picture <a href="http://xiaoyi-blog.logdown.com/posts/1749203" rel="nofollow noreferrer">http://xiaoyi-blog.logdown.com/posts/1749203</a></p>