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A visual guide to ACL Access-Control Lists
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this post was submitted on 05 Oct 2023
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Confusing. You set a mask for a user and somehow it propagated down to a group and then you change permission on that group suddenly it applies to the user? Either something is wrong here or ACL permissions make absolutely zero sense. It is 5 billion times easier to use normal permissions to set these things up.
I think it's like this: what used to be group in regular permissions output is a union of group and ACL mask in ACL output. Mask sets the upper limit of what ACL can do, so if mask is rw- then it's impossible to set a r-x ACL permission because allowing execution is not allowed.
This seems to be more geared towards enterprise environment where it could be complicated to cleanly define groups, since you can only give access to one you might run into a problem where dept. A needs access to that directory but also person G from dept. B and person K from dept. C.
Yep, it's basically a way to define new groups per directory. But these groups are hidden from the normal group commands!