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Is there any command OR combination of commands which can easily discover the subdirectories and files under dir-A belonging to 'root' and another group, say CCC, instead of checking each directory and file.
Furthermore if a directory/file belonging to 'root' and in the group of user, say xxx, can xxx open it?
All user and group ids/ownerships are actually done by number, see /etc/passwd, /etc/groups.
The names are just there for ease of reading... analogous to using DNS on the net, it's all done by numeric ip addresses in the background, it just looks like the net knows what www.google.com means.