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 security information (such as an access control list), the permissions field printed by the -l option is followed by a ‘+’ character.

显示文件[夹]：
chflags nohidden ~/Library
如想隐藏，可以在终端中执行命令：
chflags hidden ~/Library

-rw-------@   1 wingyiu  staff  626164 Aug 12  2013 Bookmarks.bak
drwxr-xr-x+   3 wingyiu  staff     102 Jan  2 20:09 Desktop
drwxr-xr-x+  34 wingyiu  staff    1156 Dec 24 19:11 Documents
drwx------+ 278 wingyiu  staff    9452 Jan  5 20:20 Downloads
drwxr-xr-x   34 wingyiu  staff    1156 Dec 23 23:40 Git
drwxr-xr-x   87 wingyiu  staff    2958 Dec 30 23:50 Github
drwx------+  70 wingyiu  staff    2380 Jan  3 17:17 Library
drwx------+   4 wingyiu  staff     136 Jan  2 20:57 Movies
drwx------+   7 wingyiu  staff     238 Oct  7  2013 Music
drwx------+ 252 wingyiu  staff    8568 Jan  5 19:57 Pictures
drwxr-xr-x+   4 wingyiu  staff     136 Sep 28  2012 Public

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