gostat.go

package main

import (
	"fmt"
	"os"
)

func usage() {
	fmt.Printf("Usage: gostat file|os PATH")
	os.Exit(1)
}

func main() {
	if len(os.Args) <= 2 {
		usage()
	}
	method := os.Args[1]
	name := os.Args[2]

	switch method {
	case "file":
		fmt.Println("Using os.Open(), then file.Stat()")

		file, err := os.Open(name)
		if err != nil {
			panic(err)
		}

		s, err := file.Stat()
		if err != nil {
			panic(err)
		}
		fmt.Printf("%#v\n", s)
	case "os":
		fmt.Println("Using os.Stat() directly")

		s, err := os.Stat(name)
		if err != nil {
			panic(err)
		}
		fmt.Printf("%#v\n", s)
	default:
		usage()
	}
}