remove alternate access method / access control list

[Fred Wheeler <fred dot wheeler at gmail dot com>]

In cygwin, ls adds a plus sign (+) after the file mode to indicate
there is an alternate access method, like this.

% touch foo
% ls -l foo
-rw-r--r--+ 1 200006507 None 0 2010-07-21 11:32 foo

chmod affects the access permissions according to the ntsec system,
but has no effect on this alternate access method.

% chmod 644 foo
% ls -l foo
-rw-r--r--+ 1 200006507 None 0 2010-07-21 11:32 foo

Is there a way to 'clean up' the access control information for a
file, so that its access permissions are exactly those cygwin would
set to get the current file mode, with no others?  It would have an
effect like this:

% command-I-am-looking-for foo
% ls -l foo
-rw-r--r--  1 200006507 None 0 2010-07-21 11:32 foo
(the plus-sign is now gone)

I take care of file permissions carefully via cygwin chmod but I found
that on one machine somehow 'Authenticated Users' got write permission
on files to which I had otherwise applied 'chmod og-w'.  I'd like to
be able to fix problems like this and whatever else might have snuck
in.

Thanks,
Fred Wheeler

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