linux ll 列出来的权限，权限组后面 @ 代表什么意思

Question

在 linux 机器上执行 ll 命令

-rw-------@ 1 jiang  staff   262B May  4 16:07 file

用户权限组后面的那个 @  符号代表什么意思？

Answer 1

In some permission systems additional symbols in the ls -l display represent additional permission features:

+ (plus) suffix indicates an access control list that can control additional permissions.
. (dot) suffix indicates an SELinux context is present. Details may be listed with the command ls -Z.
@ suffix indicates extended file attributes are present.

https://en.wikipedia.org/wiki...

即代表这个文件有一些额外的信息。