Working_with_flags

import "flag"

// Define flags
var (
	httpPort  = flag.Int("http_port", 4762, "HTTP localhost admin port.")
	configDir = flag.String("config_dir", "/etc/runsit", "Directory containing per-task *.json config files.")
)

// Use them
func main() {
	flag.Parse()

	ln, err := net.Listen("tcp", fmt.Sprintf("%s:%d", listenAddr, *httpPort))
	if err != nil {
		logger.Printf("Error listening on port %d: %v", *httpPort, err)
		os.Exit(1)
		return
	}
	logger.Printf("Listening on port %d", *httpPort)
}