Tcp listen and echo server

tcpecho.go

package main

import (
	"flag"
	"log"
	"net"
)

func main() {
	port := flag.String("port", "80", "port to listen")
	flag.Parse()
	l, err := net.Listen("tcp", ":"+*port)
	if err != nil {
		log.Fatal(err)
	}
	defer l.Close()
	for {
		conn, err := l.Accept()
		if err != nil {
			log.Fatal(err)
		}
		go func(c net.Conn) {
			log.Printf("Accepted from %s.", c.RemoteAddr())
			addr, _, _ := net.SplitHostPort(c.RemoteAddr().String())
			c.Write([]byte(addr + "\r\n"))
			c.Close()
		}(conn)
	}
}