１、下载 RubyGems
$ curl -O http://production.cf.rubygems.org/rubygems/rubygems-1.3.6.tgz
２、解压缩并进入目录
$ tar xzvf rubygems-1.3.6.tgz
$ cd rubygems-1.3.6
３、安装 RubyGems
$ ruby setup.rb
４、查看 RubyGems 版本
$ gem -v
1.3.6
５、安装 Ruby on Rails
$ gem install rails
Successfully installed rake-0.8.7
Successfully installed activesupport-2.3.5
Successfully installed activerecord-2.3.5
Successfully installed rack-1.0.1
Successfully installed actionpack-2.3.5
Successfully installed actionmailer-2.3.5
Successfully installed activeresource-2.3.5
Successfully installed rails-2.3.5
8 gems installed
Installing ri documentation for rake-0.8.7...
Installing ri documentation for activesupport-2.3.5...
Installing ri documentation for activerecord-2.3.5...
Installing ri documentation for rack-1.0.1...
Installing ri documentation for actionpack-2.3.5...
Installing ri documentation for actionmailer-2.3.5...
Installing ri documentation for activeresource-2.3.5...
Installing ri documentation for rails-2.3.5...
Installing RDoc documentation for rake-0.8.7...
Installing RDoc documentation for activesupport-2.3.5...
Installing RDoc documentation for activerecord-2.3.5...
Installing RDoc documentation for rack-1.0.1...
Installing RDoc documentation for actionpack-2.3.5...
Installing RDoc documentation for actionmailer-2.3.5...
Installing RDoc documentation for activeresource-2.3.5...
Installing RDoc documentation for rails-2.3.5...
６、查看 Ruby on Rails 版本
$ rails -v
Rails 2.3.5