如何通过stat获取目录或文件的权限的数字形式

man stat 查看帮助。

-c --format=FORMAT use the specified FORMAT instead of the default; output a new line after each use of FORMAT 使用特殊格式代替默认输出；

常用的参数有如下：

%a Access rights in octal 8进制显示访问权限，0644

%A Access rights in human readable form 以人类可读的形式输出，drwxrwxr-t

%F File type 文件的类型

%g Group ID of owner 所属组gid的号码

%G Group name of owner 所属组的名称

%h Number of hard links 硬连接的数量

linux-zpycfm:~ # stat /var/run/libalarm
  File: ‘/var/run/libalarm’
  Size:               Blocks:           IO Block:    directory
Device: 12h/18d Inode:    Links:
Access: (/drwxrwxr-t)  Uid: (    /    root)   Gid: ( /uvpalarm)
Access: -- ::31.883333421 +
Modify: -- ::24.997312107 +
Change: -- ::24.997312107 +

linux-zpycfm:~ # stat -c %a /var/run/libalarm/

linux-zpycfm:~ # stat -c %A /var/run/libalarm/
drwxrwxr-t