rails

Create a new Rails application

$ rails new [app_name]

$ rails new [app_name] --database=postgresql

$ rails server

$ rails console

$ rails generate model [ModelName] [field:type] [field:type]

$ rails generate controller [ControllerName] [action1] [action2]

$ rails db:migrate

$ rails routes

rails command [options] [arguments]

rails is the command-line interface for the Ruby on Rails web application framework. It provides tools for creating, developing, and managing Rails applications through a unified interface.
The command operates in two contexts: outside an application (primarily rails new for creating projects) and inside an application directory (all other commands). Within a project, commands are typically invoked via bin/rails to ensure the correct bundled version is used.
Rails emphasizes convention over configuration, and its CLI reflects this by providing generators that create boilerplate code following Rails conventions. The framework integrates database management, testing, asset compilation, and server operation into cohesive command-line workflows.

new appname_

Create a new Rails application with standard directory structure

Start the Puma web server (default port 3000)

Open an interactive IRB session with the application context

Run code generators for models, controllers, migrations, etc.

Remove files created by a generator

Run pending database migrations

Create the database

Load seed data from db/seeds.rb

Create database, load schema, and seed data

Display all defined routes

Run the test suite

Display help for any command

Show the Rails version

Specify environment (development, test, production)

Set server port (default 3000)

Most commands must be run from within a Rails application directory. The rails new command is the exception and creates that directory structure.
Generated code should be reviewed before use. Generators create standard patterns that may need customization for specific requirements.
Database commands require proper database configuration in config/database.yml and the appropriate database adapter gem.

Rails was created by David Heinemeier Hansson and extracted from the Basecamp project management tool in 2004. The first public release was version 1.0 in December 2005. The framework popularized the MVC pattern for web development and introduced conventions like RESTful routing that influenced many subsequent frameworks.

ruby(1), bundle(1), rake(1), gem(1)