How to create a Rails application for a specific Rails version?

• If you have multiple Rails versions installed on your application, and if you want to create a Rails application using the command below

rails demo_apps

• In this case, it will create a Rails application "apps" with the latest version installed on our machine.

• If you want to create a Rails application for specific Rails versions, use the command below

rails _x.x.x_ appname

example of

rails _2.2.2_ demo_apps

• Please make sure there is a space after rails.
• A new app has been created with the 2.2.2 codebase