(HTM) file_permissions_hardening
 (HTM) guid_suid_checkers
 (HTM) index
 (HTM) permissions_777_mean_disabling_acess_control
 (HTM) setgid_bit_in_directories
 (HTM) sticky_attribute
 (HTM) suid_attribute
 (HTM) switchboard
 (HTM) world_writable_files_problem