    # File lib/chef/knife/environment_from_file.rb, line 66
          def run
            if config[:all] == true
              load_all_environments
            else
              if @name_args[0].nil?
                show_usage
                ui.fatal("You must specify a file to load")
                exit 1
              end

              @name_args.each do |arg|
                load_environment(arg)
              end
            end
          end