OSX-如何进行创建和创建从命令行修改文件的时间 [英] OSX - How to get the creation & modification time of a file from the command line

问题描述

在解决一些编程难题时，我想看看我花了多长时间编写了解决该问题的方法.为此，我认为最好将文件创建日期与最新修改日期进行比较.

While solving some programming puzzle, I wanted to see how long it took me to write a solution to the problem. To do so, I thought it'd be a good idea to compare the file creation date with the latest modification date.

在终端(OSX)中，我尝试了以下命令，但很惊讶连续三天看到同一日期:

In the terminal (OSX), I tried the following command and was surprised to see the same date three times in a row:

stat my_file.py
16777220 10280844 -rw-r--r-- 1 username staff 0 7214 \
"Dec  5 08:32:39 2015"  \
"Dec  5 08:32:39 2015"  \
"Dec  5 08:32:39 2015"  \
"Dec  5 08:32:39 2015" 4096 16 0 my_file.py

我创建然后修改文件的方式:

The way I created then modified the file:

touch my_file.py
vim my_file.py   # <- modify some content
stat my_file.py

关于如何从命令行获取这两个日期的任何想法吗?

Any idea on how to get these two dates from the command line?

说明:我不想计时脚本的执行时间.

编辑:问题是vim在保存时更改了创建日期，接受的答案仍对有兴趣的人深入回答了该问题.

EDIT : The issue was with vim changing the creation date on save, the accepted answer still answers the question in depth for those who are interested.

推荐答案

stat报告标准Unix日期，上次访问时间，上次修改时间和inode更改时间(通常将其误认为是创建时间). Mac OS X还可以维护文件创建时间，可以使用GetFileInfo命令进行访问:

stat reports the standard Unix dates, last access time, last modification time, and inode change time (which is often mistaken for creation time). Mac OS X also maintains the file creation time, and it's accessible using the GetFileInfo command:

$ GetFileInfo -d .bash_profile
10/08/2015 09:26:35

这是一个更完整的示例:

Here's a more complete example:

$ ls -l my_file.py
ls: my_file.py: No such file or directory
$ touch my_file.py
$ stat -x my_file.py
  File: "my_file.py"
  Size: 0            FileType: Regular File
  Mode: (0644/-rw-r--r--)         Uid: (  501/     blm)  Gid: (   20/   staff)
Device: 1,5   Inode: 26863832    Links: 1
Access: Sun Dec  6 13:47:24 2015
Modify: Sun Dec  6 13:47:24 2015
Change: Sun Dec  6 13:47:24 2015
$ GetFileInfo my_file.py
file: "/Users/blm/my_file.py"
type: "\0\0\0\0"
creator: "\0\0\0\0"
attributes: avbstclinmedz
created: 12/06/2015 13:47:24
modified: 12/06/2015 13:47:24
$ echo hello >my_file.py
$ stat -x my_file.py
  File: "my_file.py"
  Size: 6            FileType: Regular File
  Mode: (0644/-rw-r--r--)         Uid: (  501/     blm)  Gid: (   20/   staff)
Device: 1,5   Inode: 26863832    Links: 1
Access: Sun Dec  6 13:47:24 2015
Modify: Sun Dec  6 13:47:35 2015
Change: Sun Dec  6 13:47:35 2015
$ GetFileInfo my_file.py
file: "/Users/blm/my_file.py"
type: "\0\0\0\0"
creator: "\0\0\0\0"
attributes: avbstclinmedz
created: 12/06/2015 13:47:24
modified: 12/06/2015 13:47:35
$ cat my_file.py
hello
$ stat -x my_file.py
  File: "my_file.py"
  Size: 6            FileType: Regular File
  Mode: (0644/-rw-r--r--)         Uid: (  501/     blm)  Gid: (   20/   staff)
Device: 1,5   Inode: 26863832    Links: 1
Access: Sun Dec  6 13:47:54 2015
Modify: Sun Dec  6 13:47:35 2015
Change: Sun Dec  6 13:47:35 2015
$ GetFileInfo my_file.py
file: "/Users/blm/my_file.py"
type: "\0\0\0\0"
creator: "\0\0\0\0"
attributes: avbstclinmedz
created: 12/06/2015 13:47:24
modified: 12/06/2015 13:47:35

请注意，使用vim进行测试可能会产生误导，因为vim会将修改后的文件写入新的临时文件，然后重命名旧文件和新文件，因此创建时间将更新为文件已写入.有关我想出的解决方法，请参见这篇文章为此.

Note that using vim to test this may be misleading because vim will write your modified file to a new temporary file, then rename the old one and the new one, so the creation time will be updated to when the file was written. See this post for a workaround I came up with for that.

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