port := flag.String("p", ":8080", "a string")
    workerId = flag.String("i", "0", "a string")
    flag.Parse()
    pwd, err := os.Getwd()
    fmt.Println(pwd)
    if err != nil {
        os.Exit(1)
    }
    fileName = pwd + "/../data_" + *workerId + ".json"
    _, err = os.Create(fileName)
    if err != nil {
        os.Exit(1)
    }