Golang : Overwrite previous output with count down timer

Just a note for myself on how to create a count down timer and how to overwrite previous output. Very useful in launching vehicles to space. ( I hope so ).

The code below will overwrite its own previous output and pay attention to the comment about play.golang.org and terminal.

 package main

 import (
  "fmt"
  "time"
 )

 func main() {
  ticker := time.Tick(time.Second)
 fmt.Println("Counting down to launch...")

  for i := 10; i >= 0; i-- {
 <-ticker
 fmt.Printf("\x0cOn 10/%d", i) // use \x0c for play.golang.org
 //fmt.Printf("\rOn 10/%d", i) // use \r if you are running this in terminal
 
  }
  fmt.Println("\nWe have lift off!")
 }

Output :

See http://play.golang.org/p/UAS4o5x2ce

Reference :

https://mmcgrana.github.io/2012/09/go-by-example-timers-and-tickers.html