For a given unit control sequence, the time relation of the unit in the worst case can be accurately obtained by computing once only with U-mode data.

To be more selective, you may prefix the mode expression with u to set the permission for users, g to set it for groups, and o to set it for others.

The suid and sgid bits are set and reset symbolically using the letter s; for example, u+s sets the suid access mode, and g-s removes the sgid mode.