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If you don't want to add separate group membership for all users, setGid their shared dir and make sure their umasks don't mess up, then you probably mean something like Groups members of other groups, using Linux ACL's. Seems using ACL's is a bit rough around the edges (if not totally unusable) as far as I can see.
Hrm. I did already look at the thread you mentioned, but it didnt seem to be the same problem as mine. I am actually listing users in each of the groups, but the groupC is supposed to have users as well as groupB in it, just like groupB has users as well as groupA in it, but it doesnt seem to work.
I really want to know if there's a limit to how much I can nest, ie., is it a "known bug" so to speak?
Traditionally, unix groups cannot be nested at all. If someone has changed the traditional behaviour on your distribution, I'd love to hear about it. This is something that would be a significant (and very difficult) enhancement.
On some distros (Red Hat linux comes to mind) of unix-derived systems, a unique group is created for each user, so that if you have a user named "bonehead" there will also be a group named "bonehead". This often confuses people and is probably not a good solution (although I understand why Red Hat did it). If you have a user with the same name as a group, that might explain why nesting seems to work in some circumstances.
If you are using the Shadow Suite, you can use the tools "pwck" and "grpck" to check your /etc/passwd and /etc/group files for errors. If you are using something more sophisticated (NIS, Hesiod, LDAP, whatever) you will have to consult whoever set up your user account provisioning system.