log.Logger & io.MultiWriter example

Overview

How to use log.Logger with io.MultiWriter.
In case of writting STDOUT and File

Example

package main

import (
	"io"
	"log"
	"os"
)

func main() {
	logFile, _ := os.Create("log.txt")
	defer logFile.Close()

	mw := io.MultiWriter(os.Stdout, logFile)
	logger := log.New(mw, "prefix ", log.LstdFlags)

	logger.Println("test")
}