Summary
Access Control Lists (ACLs) provide a method to extend the permissions associated with files and directories. Standard Unix permissions support only three types of users: the owner, a group, and everyone else. Using ACLs, unique permissions can be assigned to additional user and groups.
The Role-Based Access Control (RBAC) capability gets away from the all-or-nothing approach to system administration that is associated with the superuser account and allows specific sets of authorizations and rights to be grouped into roles. These roles can be used to spread system administration responsibilities across multiple accounts without compromising system security.
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