Answer by Kamil Maciorowski for priority of the Linux group & user

Assumption: no ACL.

• Are you the user that owns the file?
  • Yes →The owner's permissions matter. Nothing else matters. End procedure.
    ^{(The file belonging to baohua:test fits this case.)}
  • No → Are you in the group that owns the file?
    • Yes →The group's permissions matter. Nothing else matters. End procedure.
      ^{(The file belonging to test:baohua fits this case.)}
    • No →The other's permissions matter. End procedure.