# 系統程式設計 - `utime()` and `utimes()`

[TOC]

## 課程影片

### W7-2: Access permission (00:00 ~ 11:58)

{%youtube kNU5YR0xcxE %}

## 三種時間

使用 `stat`：

  File: AAAAA
  Size: 0         	Blocks: 0          IO Block: 4096   regular empty file
Device: b302h/45826d	Inode: 643011      Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/  ubuntu)   Gid: ( 1000/  ubuntu)
Access: 2021-10-20 06:54:14.897970317 +0000
Modify: 2021-10-20 06:54:14.897970317 +0000
Change: 2021-10-20 06:54:14.897970317 +0000
 Birth: -

## `utime`

如果去查 `utime()` 的 [`man`](https://man7.org/linux/man-pages/man2/utime.2.html)，他會出現以下的註記：

> Note: modern applications may prefer to use the interfaces described in [`utimensat(2)`](https://man7.org/linux/man-pages/man2/utimensat.2.html).