> How can world rw not work unless the user/group is
> correct, is this some sort of umask thing? 

I think I can answer this one, at least. Thinking of the last permissions' set 
as 'world'
is misleading. This last set is more properly the 'other' class. And in fact, 
the first
two sets (owner and group) comprise entirely separate classes, not one (the 
owner) encased
in the other (the group).

E.g. 007 permissions (------rwx) does *not* give 'everyone' read/write/execute
permissions; it only gives people who are (1) not the owner/in the owner class, 
and (2)
not in the owning group/in the group class.

Here's a few words from wikipedia about this:
http://en.wikipedia.org/wiki/Filesystem_permissions#Classes

-- 
Bryan Burke
IT Administrator
Department of Electrical Engineering and Computer Science
University of Tennessee, Knoxville
[email protected]
(865) 974-4694
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