What does directory permission 'S' mean? (not lower case, but in upper case)

Posted by Howard Guo on Super User See other posts from Super User or by Howard Guo
Published on 2012-11-22T09:13:12Z Indexed on 2012/11/22 11:05 UTC
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I downloaded Eclipse, uncompressed it, did a few other things and all sudden I notice this interesting behaviour:

^_^ ~/Downloads > sudo chmod 0000 eclipse/

^_^ ~/Downloads > stat eclipse/
  File: 'eclipse/'
  Size: 4096        Blocks: 8          IO Block: 4096   directory
Device: 801h/2049d  Inode: 529725      Links: 9
Access: (2000/d-----S---)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2012-11-22 19:54:57.752017352 +1100
Modify: 2012-09-20 18:16:26.000000000 +1000
Change: 2012-11-22 20:07:49.354016510 +1100
 Birth: -

^_^ ~/Downloads > sudo chmod 0755 eclipse/

^_^ ~/Downloads > stat eclipse/
  File: 'eclipse/'
  Size: 4096        Blocks: 8          IO Block: 4096   directory
Device: 801h/2049d  Inode: 529725      Links: 9
Access: (2755/drwxr-sr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2012-11-22 19:54:57.752017352 +1100
Modify: 2012-09-20 18:16:26.000000000 +1000
Change: 2012-11-22 20:08:19.042016478 +1100
 Birth: -

What does 'S' permission mean to a directory? And why it doesn't let me get rid of it?

Thanks.

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