filestat.go

package main

import (
	"fmt"
	"log"
	"os"
	"syscall"
	"time"
)

func main() {
	f, err := os.Open("test.txt")
	defer f.Close()

	if err != nil {
		log.Fatal(err)
	}

	fi, err := f.Stat()
	if err != nil {
		log.Fatal(err)
	}

	// The follow statements will print the following output on a linux box.
	// Basic:
	//   name: test.txt
	//   size: 11
	//   mode: -rw-r--r--
	//   modified: 2013-08-24 09:36:36.234671631 -0700 PDT
	fmt.Print("Basic:\n")
	fmt.Printf("  name: %s\n  size: %d\n  mode: %s\n  modified: %s\n",
		fi.Name(), fi.Size(), fi.Mode(), fi.ModTime())

	// More details using the syscall package
	var s syscall.Stat_t

	// Get the file descriptor of test.txt
	fd := int(f.Fd())

	err = syscall.Fstat(fd, &s)
	if err != nil {
		log.Fatal(err)
	}

	// Produce a human readable timestamp when printed as a string.
	// Note: s.Atim, s.Mtim, and s.Ctim are not defined on OS X.
	atime := time.Unix(s.Atim.Unix())
	mtime := time.Unix(s.Mtim.Unix())
	ctime := time.Unix(s.Ctim.Unix())

	// The follow statements will print the following output on a linux box.
	// Advanced:
	//   inode: 395365
	//   links: 1
	//   uid: 1000
	//   gid: 1000
	//   size: 11
	//   blockSize: 4096
	//   blocks: 8
	//   atime: 2013-08-24 09:12:57.172472315 -0700 PDT
	//   mtime: 2013-08-24 09:36:36.234671631 -0700 PDT
	//   ctime: 2013-08-24 09:36:36.234671631 -0700 PDT
	fmt.Print("\nAdvanced:\n")
	fmt.Printf("  inode: %d\n  links: %d\n  uid: %d\n  gid: %d\n"+
		"  size: %d\n  blockSize: %d\n  blocks: %d\n"+
		"  atime: %s\n  mtime: %s\n  ctime: %s\n",
		s.Ino, s.Nlink, s.Uid, s.Gid,
		s.Size, s.Blksize, s.Blocks,
		atime, mtime, ctime)
}