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I understand what is an inode user (owner) [u], group [g], and other users [o].
I understand that we could also effect all users [a], hence the term ugoa.
I understand that each of the 3 groups can have rwx- (4,2,1,0), while r = 4, w = 2, x = 1, and - = 0.
I think I also understand the concept...