>De man shutdown: > > If shutdown is called with the -a argument (add this to the >invocation of shutdown in /etc/inittab), it checks to see if the file >/etc/shutdown.allow is present. It then compares the login names in >that file with the list of people that are logged in in a virtual >console (from /var/run/utmp). Only if one of those authorized users >or root is logged in, it will proceed.
Si mi inglés no me falla, acá dice que solamente si uno de los usuarios esta loggeado, ejecuta el shutdown, pero no dice nada sobre *quien* ejecuta el shutdown
