The exam­ples are just exam­ples. I did not intend to give the same exam­ples for absolute and rel­a­tive nota­tion (which is impos­si­ble with­out show­ing a file/directory with spe­cif­ic access rights). g+w adds group write access no mat­ter what oth­er set­tings are there, where­as the absolute exam­ples do not keep the remain­ing access rights. Please do not com­pare them.