In this tutorial we will see what ACLs are, and how to do the basic manipulation of this kind of permissions on a Linux platform. The below instructions will work on any Linux distribution. I‘m assuming you know and are comfortable using standard Linux discretionary ugo/rwx permissions.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-manage-acls-on-linux
ACLs have never been standardized, so its use is non portable. Probably in the next few years will be done in POSIX.1e (POSIX.2c). Good article.