docs: function (len) {
      _.isNumber(len) || (len = 1)
      
      while (len--) {
        readline.moveCursor(this.rl.output, -cliWidth(), 0)
        readline.clearLine(this.rl.output, 0)
        if (len) {
          readline.moveCursor(this.rl.output, 0, -1)
        }
      }
      return this
    }