CHMOD 4755 doesn't work

[pdb at sei.cmu.edu.UUCP]

I've never had an problem using set-uid programs; chmod 4755 should do
it.  Of course, this only works for *programs* (i.e., something that has
come out of a compiler).  You can't set-uid a shell script (Well, actually,
most versions of 4.2 and 4.3 do let you do this, but you really *don't* want
to, as it causes a massive security hole; see the recent discussion on
comp.unix.wizards).

--Pat.