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Rails comes with a number of scripts called generators that are designed to make your development life easier by creating everything that's necessary to start working on a particular task.
One of these is the new application generator, which will provide you with the foundation of a fresh Rails application so that you don't have to write it yourself.
For most UNIX-like systems including mac OS this will be a dollar sign .Each action's purpose is to collect information to provide it to a view.A view's purpose is to display this information in a human readable format.There are several curated lists of online resources for learning Ruby: Be aware that some resources, while still excellent, cover versions of Ruby as old as 1.6, and commonly 1.8, and will not include some syntax that you will see in day-to-day development with Rails.Rails is a web application development framework written in the Ruby language.