package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
)

func main() {
	var (
    		root string
    		files []string
    		err error
	  )

	if len(os.Args) == 1 {
		log.Fatal("No path given, Please specify path.")
		return
	}
	if root = os.Args[1]; root == "" {
		log.Fatal("No path given, Please specify path.")
		return
	}
	// filepath.Walk
	 files, err = FilePathWalkDir(root)
	 if err != nil {
	 	panic(err)
	 }
	// ioutil.ReadDir
	 files, err = IOReadDir(root)
	 if err != nil {
	 	panic(err)
	 }
	//os.File.Readdir
	files, err = OSReadDir(root)
	if err != nil {
		panic(err)
	}

	for _, file := range files {
		fmt.Println(file)
	}
}