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Well, o +w means something like "Give write access to others group", so it would be 0002.
(Or without the leading 0: 002)
http://www.javascriptkit.com/script/script2/chmodcal.shtml
the numbers are in octal (if you know the octal no. system).
they stand for owner(1st digit), group (2nd digit), others.
each digit is the sum of write,read,execute permissions in octal.
