On Tue, Dec 31, 2002 at 05:49:08AM -0500, Ludwig wrote: > On Tue, 2002-12-31 at 05:34, Andrew Pritchard wrote: > > Is there a way of limiting who and SU to root? > > > > As root, > > chmod go-x /usr/bin/who > This won't do anything. $ last -f /var/run/utmp will do the same thing as who What you need to do is chmod 600 /var/run/utmp