code: function defaultCommand() {
      if (keys.length <= 0) {
          throw new Error("Error: there is no command at all!");
      };
  
      for (var p in commands) {
          if (commands[p]["default"]) {
              return commands[p];
          };
      };
  
      if (keys["--help"]) {
          return commands["--help"];
      } else {
          return commands[keys[0]];
      };
  }
docs: default command when no command line argas provided.