mac系统中文件的@权限

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如果文件或目录有扩展属性,则使用-l选项执行ls命令时，会在权限许可字段后面附加一个字符@。
如果文件或目录有扩展安全信息，则使用-l选项执行ls命令时，会在权限许可字段后面附件一个字符+。

If the file or directory has extended
attributes, the permissions field printed by the -l option is followed by
a ‘@’ character. Otherwise, if the file or directory has extended secu-
rity information, the permissions field printed by the -l option is fol-
lowed by a ‘+’ character.

详见man ls(1) on Max OS X

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