Gemset：此系统上当前未安装Rails。
macbook$ rvm gemset list_all gemsets for ruby-1.9.2-p320 (found in /Users/macbook/.rvm/gems/ruby-1.9.2-p320) global gemsets for ruby-1.9.3-p194 (found in /Users/macbook/.rvm/gems/ruby-1.9.3-p194) nice global macbook$ rvm use ruby-1.9.3-p194@nice Using /Users/macbook/.rvm/gems/ruby-1.9.3-p194@nice with gemset global macbook$ rails --version Rails is not currently installed on this system. To get the latest version, simply type: $ sudo gem install rails You can then rerun your "rails" command. macbook$ sudo gem install rails 1 gem successfully installed. macbook$ rails --version Rails is not currently installed on this system. To get the latest version, simply type: $ sudo gem install rails You can then rerun your "rails" command.
macbook$ rvm use ruby-1.9.3-p194 Using /Users/macbook/.rvm/gems/ruby-1.9.3-p194 macbook$ rails --version Rails 3.2.11