[wplug] sharing files with another user

[Brandon Kuczenski]

What is the best way to make a certain file on a POSIX system readable by
one other user?

I've thought about this a little, and can't come up with a way to do it
without involving root (editing, at the very least, /etc/group).  I am
running a system on which each user has his/her own group, and so by
adding the 'privileged' user to the owner's group, the owner can then
share selected files with the 'privileged' user.  But that requires asking
root to help, which seems nonideal.

-Brandon