git logging to-file example

gistfile1.go

package main

import (
	"flag"
	"log"
	"os"
)

var (
	logFile = flag.String("log-file", "", "Log file name")
	message = flag.String("message", "hello", "Message to log")
)

func init() {
	flag.Parse()
}

func main() {
	if *logFile == "" {
		log.Fatalf("Need a log file\n")
	}

	f, err := os.OpenFile(*logFile, os.O_RDWR|os.O_APPEND, 0660)
	if err != nil {
		log.Fatalf("Cannot create log file: %v\n", err)
	}
	defer f.Close()

	logger := log.New(f, "INFO: ", log.Ldate|log.Ltime)
	logger.Println(*message)
}