Linux系统将时间标记分三类：
atime( A ccess time)：档案上次被读取的时间。
ctime(status C hange time)：档案的属性或内容上次被修改的时间。
mtime( M odified time)：档案的内容上次被修改的时间。
下面我将用实验给大家讲解一下：
[root@localhost ~]# touch a.txt ==》创建文件a.txt
[root@localhost ~]# stat a.txt ==》查看时间戳
File: "a.txt"
Size: 0 Blocks: 0 IO Block: 4096 普通空文件
Device: fd00h/64768dInode: 674903 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2018-03-10 13:29:04.130157512 +0800
Modify: 2018-03-10 13:29:04.130157512 +0800
Change: 2018-03-10 13:29:04.130157512 +0800
[root@localhost ~]# echo 1>> a.txt ==》向文件a.txt追加内容
[root@localhost ~]# stat a.txt ==》查看追加内容后的文件时间戳
File: "a.txt"
Size: 1 Blocks: 8 IO Block: 4096 普通文件
Device: fd00h/64768dInode: 674903 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2018-03-10 13:29:04.130157512 +0800
Modify: 2018-03-10 13:29:19.351159892 +0800 ==》时间戳改变
Change: 2018-03-10 13:29:19.351159892 +0800 ==》时间戳改变
[root@localhost ~]# chmod +x a.txt ==》修改文件a.txt的权限
[root@localhost ~]# stat a.txt ==》查看修改权限后的文件时间戳
File: "a.txt"
Size: 1 Blocks: 8 IO Block: 4096 普通文件
Device: fd00h/64768dInode: 674903 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2018-03-10 13:29:04.130157512 +0800
Modify: 2018-03-10 13:29:19.351159892 +0800
Change: 2018-03-10 13:29:42.156153774 +0800 ==》时间戳改变
[root@localhost ~]# cat a.txt ==》查看文件a.txt
[root@localhost ~]# stat a.txt ==》查看文件a.txt的时间戳
File: "a.txt"
Size: 1 Blocks: 8 IO Block: 4096 普通文件
Device: fd00h/64768dInode: 674903 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2018-03-10 13:30:00.010155999 +0800 ==》时间戳改变
Modify: 2018-03-10 13:29:19.351159892 +0800
Change: 2018-03-10 13:29:42.156153774 +0800
[root@localhost ~]# vim a.txt ==》向文件a.txt添加内容
daskhdjkas
"a.txt" 1L, 11C 已写入
[root@localhost ~]# stat a.txt ==>查看文件a.txt的时间戳
File: "a.txt"
Size: 11 Blocks: 8 IO Block: 4096 普通文件
Device: fd00h/64768dInode: 674908 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2018-03-10 13:30:34.652158960 +0800 ==》时间戳改变
Modify: 2018-03-10 13:30:34.652158960 +0800==》时间戳改变
Change: 2018-03-10 13:30:34.653158940 +0800==》时间戳改变