rails_run_file.rb

#!/usr/bin/env ruby
APP_PATH = File.expand_path('../config/application', __FILE__)
require File.expand_path('../config/environment',  __FILE__)
require_relative 'config/boot'
ActiveRecord::Base.logger = ActiveSupport::Logger.new(STDOUT)

module Mod
  module_function
  
  def method1
    'method1'
  end
  
  def method2
    'method2'
  end
end

method = ARGV[0]
raise ArgumentError, 'mo method passed' unless method

puts "#{method}..."
puts Mod.send(method)