这几天碰到的一个面试题。

find用法：
 
  -atime n
              File was last accessed n*24 hours ago.  访问（读取文件或执行文件）
      
 -ctime n
              File’s status was last changed n*24 hours ago.  写入修改 更改属主

 -mtime n
              File’s  data was last modified n*24 hours ago.  写入修改
 
 -amin n
              File was last accessed n minutes ago.这是按分钟来算的一般不用
 -cmin n
              File’s status was last changed n minutes ago.

关于+n还是-n

        +n     for greater than n,  #N天以外的，N天前的

        -n     for less than n,     #N天以内的

        n      for exactly n.     #正好的

例子：
-bash-3.2$ ll
total 24
-rw-r–r– 1 wss8848 member    6 2010-07-13 20:58 1.txt
-rw-r–r– 1 wss8848 member   63 2010-07-11 21:08 awk.txt
-rwxr–r– 1 wss8848 member  160 2010-07-04 00:00 if.sh
-bash-3.2$ find -atime +8
./if.sh
-bash-3.2$ date
Tue Jul 13 21:31:04 CST 2010
-bash-3.2$