1·Rails 3 obsolesces the family of scripts (script/server, script/generate, and the rest) found in each application and replaces it with a single command, aptly named rails.
有了 Rails 3，无需在每一个应用程序中使用整套脚本（script/server、script/generate 以及其他），使用一条命令即可取代其功能，该命令恰如其分地被命名为 rails。