How can I clear the terminal screen in Go?

Are there any standard method in Golang to clear the terminal screen when I run a GO script? or I have to use some other libraries?

Note: Running a command to clear the screen is not a secure way. Check the other answers here as well.

---

You have to define a clear method for every different OS, like this. When the user's os is unsupported it panics

package main

import (
	"fmt"
	"os"
	"os/exec"
	"runtime"
	"time"
)

var clear map[string]func() //create a map for storing clear funcs

func init() {
	clear = make(map[string]func()) //Initialize it
	clear["linux"] = func() { 
		cmd := exec.Command("clear") //Linux example, its tested
		cmd.Stdout = os.Stdout
		cmd.Run()
	}
	clear["windows"] = func() {
		cmd := exec.Command("cmd", "/c", "cls") //Windows example, its tested 
		cmd.Stdout = os.Stdout
		cmd.Run()
	}
}

func CallClear() {
	value, ok := clear[runtime.GOOS] //runtime.GOOS -> linux, windows, darwin etc.
	if ok { //if we defined a clear func for that platform:
		value()  //we execute it
	} else { //unsupported platform
		panic("Your platform is unsupported! I can't clear terminal screen :(")
	}
}

func main() {
	fmt.Println("I will clean the screen in 2 seconds!")
	time.Sleep(2 * time.Second)
	CallClear()
	fmt.Println("I'm alone...")
}

(the command execution is from @merosss' answer)

You could do it with ANSI escape codes:

fmt.Print("\033[H\033[2J")

But you should know that there is no bulletproof cross-platform solution for such task. You should check platform (Windows / UNIX) and use cls / clear or escape codes.

Use goterm

package main

import (
	tm "github.com/buger/goterm"
	"time"
)
func main() {
	tm.Clear() // Clear current screen
	for {
		// By moving cursor to top-left position we ensure that console output
		// will be overwritten each time, instead of adding new.
		tm.MoveCursor(1, 1)
		tm.Println("Current Time:", time.Now().Format(time.RFC1123))
		tm.Flush() // Call it every time at the end of rendering
		time.Sleep(time.Second)
	}
}

Don't use command execution for this. It's overkill, and not guaranteed to work, and it's not secure.

---

I created a small cross-platform package. So it works on Windows, Linux, OS X, etc.

Install it like this:

go get https://github.com/inancgumus/screen

Then you can use it like so:

package main

import (
    "fmt"
    "time"
    "github.com/inancgumus/screen"
)

func main() {
    // Clears the screen
    screen.Clear()

    for {
        // Moves the cursor to the top left corner of the screen
        screen.MoveTopLeft()

        fmt.Println(time.Now())
        time.Sleep(time.Second)
    }
}

As reported here you can use the following three lines to clear the screen:

c := exec.Command("clear")
c.Stdout = os.Stdout
c.Run()

Don't forget to import "os" and "os/exec".

Easy solution only for nix systems (linux, unix, etc.):

fmt.Println("\033[2J")

For me (tested on my mobile phone in termux) this works:

os.Stdout.Write([]byte{0x1B, 0x5B, 0x33, 0x3B, 0x4A, 0x1B, 0x5B, 0x48, 0x1B, 0x5B, 0x32, 0x4A})