Log Example For Go

log.go

package utils

import (
	"log"
	"os"
)

var (
	Log      *log.Logger
)

func NewLog(logpath string) {
	println("LogFile: " + logpath)
	file, err := os.Create(logpath)
	if err != nil {
		panic(err)
	}
	Log = log.New(file, "", log.LstdFlags|log.Lshortfile)
}

main.go

package main

import (
	"./utils"
	"flag"
	"time"
)

var (
	logpath = flag.String("logpath", "/tmp/weather.log", "Log Path")
)

func main() {
	flag.Parse()
	utils.NewLog(*logpath)
	utils.Log.Println("hello")
	for i := 0; i < 10; i++ {
		utils.Log.Println(i)
	}
	time.Sleep(3 * time.Second)
}