Very Computer

I have a need to allow 3 users read and write access to a directory and
files within that directory without having access to the /etc/groups
file on the system.

Is there anyway to emulate a small group using hard and soft links that
will work well for this kind of application?

Thanks,
--

The strongest reason for the people to retain their right to keep and
bear arms is,  as a last resort, to protect themselves against tyranny
in government.
        -- Thomas Jefferson