Function usage

examples/nats-echo/main.go:35–38

NOTE: Can test with demo servers. nats-echo -s demo.nats.io <subject>

()

// nats-echo -s demo.nats.io <subject>

func usage() {
	log.Printf("Usage: nats-echo [-s server] [-creds file] [-t] <subject>\n")
	flag.PrintDefaults()
}

func showUsageAndExit(exitcode int) {
	usage()