标签：regular access change touch modify linux
生产发现一个问题，找到根源是因为文件被修改了，然后通过查看修改的时间，权限用户，找到操作的机器，其中发现一个点就是Linux文件时间记录，有三个Access(访问),Modfiy(vi编辑),Change(修改权限)
常用的查看为stat filename和ls -l --full-time filename
1，当我们仅仅只是读取文件时，access time 改变，而modify，change time 不会改变
2，当修改文件时，access，modify，change time 都会跟着改变
3，当修改文件属性时，change time 改变，而access，modify time 不变
所以掌握了这一点，通过touch可以彻底改变你动文件的时间，你看到的就不是真的
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2126 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652821 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:08:26.571999874 +0800 --精确到毫秒级别
Modify: 2016-08-28 18:08:26.571999874 +0800
Change: 2016-08-28 18:08:26.575999780 +0800
[root@localhost ~]# cat 3.sql
- MySQL dump 10.13 Distrib 5.5.22, for Linux (i686)
--
-- Host: 192.168.4.11 Database: test
-- ------------------------------------------------------
-- Server version 5.5.22-log
。。。。。。。。
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2126 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652821 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:18:50.937999994 +0800 --因为刚才执行了cat 所以只改变
Modify: 2016-08-28 18:08:26.571999874 +0800
Change: 2016-08-28 18:08:26.575999780 +0800
[root@localhost ~]# vi 3.sql
- MySQL dump 10.13 Distrib 5.5.22, for Linux (i686)
--
-- Host: 192.168.4.11 Database: test
-- ------------------------------------------------------
-- Server version 5.5.22-log
。。。。。。。。[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:20:36.679998313 +0800---可以看到vi时都变了
Modify: 2016-08-28 18:20:36.679998313 +0800
Change: 2016-08-28 18:20:36.696998878 +0800
[root@localhost ~]# chmod o+w 3.sql
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0757/-rwxr-xrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:20:36.679998313 +0800
Modify: 2016-08-28 18:20:36.679998313 +0800
Change: 2016-08-28 18:21:43.217999570 +0800
[root@localhost ~]#
[root@localhost ~]# info touch --这个东西不仅可以创建文件还可以更改文件时间
time stamps.
The program accepts the following options. Also see *note Common
options::.
`-a‘
`--time=atime‘
`--time=access‘
`--time=use‘
Change the access time only.
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0757/-rwxr-xrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:24:23.473989642 +0800
Modify: 2016-08-28 18:24:23.473989642 +0800
Change: 2016-08-28 18:24:23.473989642 +0800
[root@localhost ~]# touch -a 3.sql ---加参数-a
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0757/-rwxr-xrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:24:34.580998824 +0800
Modify: 2016-08-28 18:24:23.473989642 +0800
Change: 2016-08-28 18:24:34.580998824 +0800
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0757/-rwxr-xrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:24:34.580998824 +0800
Modify: 2016-08-28 18:24:23.473989642 +0800
Change: 2016-08-28 18:24:34.580998824 +0800
[root@localhost ~]#
[root@localhost ~]# touch 3.sql --木有加参数
[root@localhost ~]# stat 3.sql
File: `3.sql‘
Size: 2127 Blocks: 8 IO Block: 4096 regular file
Device: 802h/2050d Inode: 652820 Links: 1
Access: (0757/-rwxr-xrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-08-28 18:28:26.230998361 +0800
Modify: 2016-08-28 18:28:26.230998361 +0800
Change: 2016-08-28 18:28:26.230998361 +0800
[root@localhost ~]#
本文出自 “运维邦” 博客，谢绝转载！
标签：regular access change touch modify linux
原文地址：http://aklaus.blog.51cto.com/9724632/1843630
