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drwxr-xr-x@ 13 me staff 442 Dec 3 04:57 projects

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up vote 3 down vote accepted

It's undocumented from what I've found in the past - however it means that the object has extended attributes. Here is what I found when I looked a few months ago: http://forthescience.org/blog/2007/12/11/macosx-leopard-extended-ls/

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+1 interesting, wonder if they are doing that to stop OSX from scattering .DS_Info files all over. –  Zypher Dec 15 '09 at 5:15
    
That's an interesting thought. I know I still deal with pesky .DS_Info files all the time. –  Dave Holland Dec 15 '09 at 5:17
    
Here is documentation on how to disable it: support.apple.com/kb/HT1629 –  p858snake Dec 15 '09 at 6:32
    
The .DS_Store creation, I mean. –  p858snake Dec 15 '09 at 6:33
    
Thanks snake.. will use this –  Dave Holland Dec 15 '09 at 6:57
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From "man ls"

The following options are available:
-@      Display extended attribute keys and sizes in long (-l) output.

The Long Format
 If the -l option is given, the following information is displayed for each
 ...
 If the file or directory has extended attributes, the permissions field
 printed by the -l option is followed by a '@' character.  Otherwise, if the
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