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what does the @ mean on the output of ls on os x terminal?

I found this symbol @ when I run ls -al in my home folder, what does it mean here?

drwxr-xr-x   7 yangchenyun  admin   238 Jul 19 16:32 Code
drwx------@ 25 yangchenyun  admin   850 Oct  2 20:08 Dropbox
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ls -la symbolics... what does that last symbol mean?, What does the @ in ls -al mean?, Why are some files in ls -l on Mac OSX (Snow Leopard) tagged with "@"?, et cetera. Please research for an answer before asking a question. The ls manpage has all the info, too. –  slhck Oct 4 '12 at 10:54
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marked as duplicate by slhck Oct 4 '12 at 10:53

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up vote 4 down vote accepted

According to info ls, section 10.1.2, What information is listed (from the manual for GNU coreutils 8.5):

 Following the file mode bits is a single character that specifies
 whether an alternate access method such as an access control list
 applies to the file.  When the character following the file mode
 bits is a space, there is no alternate access method.  When it is
 a printing character, then there is such a method.

So the @ indicates that there exists an alternate access method on the file. This most likely means an ACL. Try getfacl Dropbox and see what you get.

You may need to install some package to get the ACL-related commands. In Debian, getfacl is provided by the acl package, so sudo apt-get install acl if it isn't installed already. Other distributions may or may not use the same package name.

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@ Seems to indicate extended attributes (at least in Mac OS X, see http://lists.apple.com/archives/darwin-userlevel/2007/Nov/msg00013.html)

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