    # File lib/chef/knife/environment_from_file.rb, line 35
          def run
            if @name_args[0].nil?
              show_usage
              ui.fatal("You must specify a file to load")
              exit 1
            end

            updated = loader.load_from("environments", @name_args[0])
            updated.save
            output(format_for_display(updated)) if config[:print_after]
            ui.info("Updated Environment #{updated.name}")
          end