Using the ls -l command, we can view standard permission and tell whether a file or a directory has ACL applied to it. If the tenth character in the permission is the + symbol, then it indicates that ACL is applied on that file or directory.

If the plus (+) symbol is present on a file, it means the user permission represents the user ACL setting, the group permission represents the ACL mask (and not the group owner setting), and other permissions are other ACL settings. An example to find out whether the ACL permissions are applied on file is shown in the following screenshot: