stat统计某个文件的修改接入时间。
$stat nginx.conf File: `nginx.conf' Size: 924 Blocks: 8 IO Block: 4096 regular file Device: fc01h/6456d Inode: 5634998 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2018-01-22 12:24:05.371332172 +0800 Modify: 2017-09-14 13:13:34.755290649 +0800 Change: 2017-08-14 15:13:34.762408563 +0800