Mac OS X, beginning with version In AmigaOS 1. Notation of traditional Unix permissions[ edit ] Unix permissions are represented either in symbolic notation or in octal notation. The classical behaviour of the sticky bit on executable files has been to encourage the kernel to retain the resulting process image in memory beyond termination; however such use of the sticky bit is now restricted to only a minority of unix-like operating systems HP-UX and UnixWare.
The effect of setting the permissions on a directory, rather than a file, is "one of the most frequently misunderstood file permission issues". There is no permission in these systems which would prevent a user from reading a file.
When setgid is applied to a directory, new files and directories created under that directory will inherit their group from that directory.
Changing permission behavior with setuid, setgid, and sticky bits[ edit ] Unix-like systems typically employ three additional modes. OpenVMS also uses a permission scheme similar to that of Unix, but more complex.
Those with administrative rights or privileges can change the computer or its files generally in any fashion, such as by creating accounts for other users or downloading and installing applications on a computer or network of them.
These additional modes are also referred to as setuid bit, setgid bit, and sticky bit, due to the fact that they each occupy only one bit.
Also known as the Text mode. Default behaviour is to use the primary group of the effective user when setting the group of new files and directories, except on BSD-derived systems which behave as though the setgid bit is always set on all directories See Setuid.
Basic User Level Accessfor example, is a restrictive access level that specifies the user has access to records the user owns or shares.