find用法

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.这是按分钟来算的通常不用
 -cmin n
              File’s status was last changed n minutes ago.

关于+n仍是-n

        +n     for greater than n,  #N天之外的，N天前的

        -n     for less than n,     #N天之内的

        n      for exactly n.     #正好的