perform

# File railties/lib/rails/commands/runner/runner_command.rb, line 23
      def perform(code_or_file = nil, *command_argv)
        extract_environment_option_from_argument

        unless code_or_file
          help
          exit 1
        end

        ENV["RAILS_ENV"] = options[:environment]

        require_application_and_environment!
        Rails.application.load_runner

        ARGV.replace(command_argv)

        if code_or_file == "-"
          eval($stdin.read, TOPLEVEL_BINDING, "stdin")
        elsif File.exist?(code_or_file)
          $0 = code_or_file
          Kernel.load code_or_file
        else
          begin
            eval(code_or_file, TOPLEVEL_BINDING, __FILE__, __LINE__)
          rescue SyntaxError, NameError => e
            error "Please specify a valid ruby command or the path of a script to run."
            error "Run '#{self.class.executable} -h' for help."
            error ""
            error e
            exit 1
          end
        end
      end