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12.3 Definitions
- user class
-
The conventional POSIX permission concept uses three
classes of users for assigning permissions
in the file system: the owner, the owning group, and other users.
Three permission bits can be set for each user class, giving
permission to read (r), write
(w), and execute (x).
- access ACL
-
The user and group access permissions for all kinds of
file system objects (files and directories) are determined by
means of access ACLs.
- default ACL
-
Default ACLs can only be applied to directories. They
determine the permissions a file system object inherits from its
parent directory when it is created.
- ACL entry
-
Each ACL consists of a set of ACL entries. An ACL entry
contains a type, a qualifier for the user or group to which the
entry refers, and a set of permissions. For some entry types, the
qualifier for the group or users is undefined.
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