lib/tty.js
function (x) {
    _.isNumber(x) || (x = 1)
    readline.moveCursor(this.rl.output, 0, -x)
    return this
  }
function (x) {
    _.isNumber(x) || (x = 1)
    readline.moveCursor(this.rl.output, 0, -x)
    return this
  }
function ( x ) { _ . isNumber ( x ) || ( x = 1 ) readline . moveCursor ( this . rl . output , 0 , - x ) return this }
Move cursor up.

@param {number} x How far to go up (default to 1).
@return {Object} Self.
Move cursor up .