Pinging sites using goroutines

main.go

package main

import (
	"fmt"
	"os/exec"
	"strings"
	"sync"
)

func isSiteDown(site string, group *sync.WaitGroup) {
	defer group.Done()

	cmd := exec.Command("ping", "-n", "1", "-a", site)

	_, err := cmd.CombinedOutput()

	if err == nil {
		fmt.Println(strings.Replace("Site alive: %", "%", site, 1))
	} else {
		fmt.Println(strings.Replace("SITE DOWN! %", "%", site, 1))
	}
}

func main() {
	var sites = [5]string{
		"www.google.com",
		"www.thisdoesnotexists.com",
		"www.duckduckgo.com",
		"www.medium.com",
		"www.thisalsodoesntexists.com",
	}

	var waitGroup sync.WaitGroup

	for _, site := range sites {
		waitGroup.Add(1)
		go isSiteDown(site, &waitGroup)
	}

	waitGroup.Wait()
}