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An Access Control List (ACL) stores a series of entries that identify specific users or groups and their access privileges for a directory or file. A file may have its own ACL or may share an ACL with other files. ACLs have the advantage of specifying detailed access permissions for multiple users and groups. For VxFS file systems created with the Version 5, 6, or 7 disk layouts, up to 1024 ACL entries can be specified. ACLs are also supported on cluster file systems.
See the getacl(1) and setacl(1) manual pages.