Rails是否使用与其余系统不同版本的Ruby？

Question

My installation of Rails seems to be using a different version of Ruby from the version of Ruby on the rest of my system:

$ rails --version

Rails 5 requires Ruby 2.2.2 or newer.

You're running
  ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]

Please upgrade to Ruby 2.2.2 or newer to continue.
$ ruby --version
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]

Why is this? I installed Rails with sudo gem install rails . I'm on OSX and don't remember how I installed Ruby.

Answer 1

Mac OSX comes ruby installed as default. If you need more late versions of ruby, you need to follow this guide: http://railsapps.github.io/installrubyonrails-mac.html