>how difficult is to use /etc/groups more intensively?
>it's really ease.

Well, if you add yourself to enough groups, you may not be able
to login.  The number of groups a user may belong to is a fixed
number.  The standard builds limit it to 16 ... and you must 
recompile userland programs to increase the limit, not just the
kernel.  

I may have to use solaris or some other OS to do what I need.  I'd
much rather use NetBSD!  This problem is just lurking out there to
bite someone who needs more than 16 groups.  And if you don't have
ACLs, belonging to a large number of groups is the only way to
simulate them.

Just because you don't need more than 16 groups doesn't mean that
others don't.

-- 
Phil Nelson
e-mail: philnelson@home.com  (Work: phil@cs.wwu.edu)
web: members.home.com/philnelson