Working with file permissions

Understanding file protection
        The owner attribute
        The group attribute
        Discretionary access control (DAC): permission bits
        Discretionary access control (DAC): access control lists
                The minimal ACL
                Additional ACL entries
                        Class entries
                        Default access control lists
                How the system generates an ACL
                Examining an ACL
                Changing the access control list of a file
        Set-UID and set-GID