if len(os.Args) != 2 {

fmt.Fprintf(os.Stderr, "Usage: %s hostname\n", os.Args[0])

os.Exit(1)

}

name := os.Args[1]

addr, err := net.LookupCNAME(name)

if err != nil {

fmt.Println("Error: ", err.Error())

os.Exit(2)

}

fmt.Println("Canonical address is", addr)

os.Exit(0)

}