File permissions are thus represented with nine bits. The three most significant representing the owner rights and the three least significant representing others rights. For instance, a typical file permission is <code>640</code> which means <q style="font-style:italic">The owner can read an write, the group have a read-only access, and other can't even read it</q>.
Alter permissions meaning ===
There is actually three more bits that
allow you to alter the meaning of other permissions