12.0 Access Control Lists in Linux
POSIX ACLs (access control lists) can be used as an expansion
of the traditional permission concept for file system objects. With
ACLs, permissions can be defined more flexibly than the traditional
permission concept allows.
The term POSIX ACL suggests that this is a
true POSIX (portable operating system interface)
standard. The respective draft standards POSIX 1003.1e and POSIX
1003.2c have been withdrawn for several reasons. Nevertheless, ACLs as
found on many systems belonging to the UNIX family are based on these
drafts and the implementation of file system ACLs as described in this
chapter follows these two standards as well. They can be viewed at
https://wt.xpilot.org/publications/posix.1e/.
