Switch or substitute user ? (was /etc/opt/kde3 ??)

Close enough. man su

NAME su - run a shell with SUBSTITUTE USER and group IDs

I know... means the same thing, but I feel, what the heck, if yer gonna get technical, be correct.

One must always be correct, if given the opportunity :-) Now I don't have an old BSD system handy any more, but I wonder what that ancient tome would say on the subject. Like Jeffrey, I recall switch user rather than what the current manpage suggests. Of course I'm old and the memory isn't what used to be :-) but I don't think I would have made that up. Bob