My first Go app

knockat.go

package main

import (
        "net"
        "os"
        "time"
)

func main() {
        host := os.Args[1] + ":" + os.Args[2]

        for i := 0; i < 60; i++ {
                _, err := net.DialTimeout("tcp", host, 2*time.Second)

                if err == nil {
                        os.Exit(0)
                }
        }

        os.Exit(1)
}