Linux 下查看文件时，ls –l 缺省是不显示秒的：

$ ls -l
total 0
-rw-r--r-- 1 gps gps 0 2012-06-12 16:21 README.txt
-rw-r--r-- 1 gps gps 0 2012-06-12 16:21 test.txt

要显示秒（实际更精确），可以用 –full-time 参数：

$ ls --full-time
total 0
-rw-r--r-- 1 gps gps 0 2012-06-12 16:21:15.550557727 +0800 README.txt
-rw-r--r-- 1 gps gps 0 2012-06-12 16:21:23.720354220 +0800 test.txt

要显示更多信息，用 stat 命令：

$ stat test.txt
  File: `test.txt'
  Size: 0               Blocks: 0          IO Block: 4096   regular empty file
Device: 801h/2049d      Inode: 4980751     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/     gps)   Gid: ( 1000/     gps)
Access: 2012-06-12 16:21:23.720354220 +0800
Modify: 2012-06-12 16:21:23.720354220 +0800
Change: 2012-06-12 16:21:23.720354220 +0800