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What an Access Control List (ACL)? |
ACL stands for Access Control List, and an ACL is a list of permissions that correspond to a file the same way UID:GID and rwxr-xr-- do. The ACL permissions are an extension of the usual permissions on a file. ACL's give us a way to let specific users access files, users who would not otherwise have access. See also the ACL question(s) in the System Administration section. When there is an an active ACL list for a file, then ls -l will show a (+) sign after the permissions bit, i.e.:-rwxr-xr-x+
ACL's can be used to let two different groups have access to a file, or they can be used on a more specific per user basis. ACL's can also be put onto a directory, and then new files will inherit the default ACL's.
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