Rails 5 Generator Help

$rails g helper --help

Usage:
  rails generate generator NAME [options]

Options:
      [--skip-namespace], [--no-skip-namespace]  # Skip namespace (affects only isolated applications)
      [--namespace], [--no-namespace]            # Namespace generator under lib/generators/name
                                                 # Default: true
  -t, [--test-framework=NAME]                    # Test framework to be invoked
                                                 # Default: test_unit

Runtime options:
  -f, [--force]                    # Overwrite files that already exist
  -p, [--pretend], [--no-pretend]  # Run but do not make any changes
  -q, [--quiet], [--no-quiet]      # Suppress status output
  -s, [--skip], [--no-skip]        # Skip files that already exist

Description:
    Stubs out a new generator at lib/generators. Pass the generator name as an argument,
    either CamelCased or snake_cased.

Example:
    `rails generate generator Awesome`

    creates a standard awesome generator:
        lib/generators/awesome/
        lib/generators/awesome/awesome_generator.rb
        lib/generators/awesome/USAGE
        lib/generators/awesome/templates/
        test/lib/generators/awesome_generator_test.rb