I am trying to figure out how permissions work in Linux.  In windows if I want someone to have access to something you put their name in a group then give that group access to that folder. However things can get difficult when you have an office with a folder structure like this:  Taxoffice-àNames-à Private.  Everyone in the group would need access to the Taxoffice folder and names folder but lets say only 4 people out of 12 need access to the private folder. 2 of those people need read only access and 2 full access. In windows this is easy because you can apply multiple groups and peoples permissions to a folder and file. How is this done in Linux when all I see is Owner and 1 Group permission?