>>>> Exactly how do they not work?
>>>
>>> They don't display anything.  If I type "users" at the prompt and hit
>>> [Enter], I'm immediately thrust back to the prompt on the next line.   There
>>> is no message indicating improper usage, nor is there any message stating
>>> that the command cannot be found.

Is your DNS set up? Or at least do you have your hosts file filled in? In 
the past, commands like that (and w, for instance) would hang while trying 
to look up reverse DNS. Nowadays, something's changed, because command 
will return with a user not in the list immediately rather than waiting 
90+ seconds for the DNS lookup to fail.

John