shutdown termination

[sscalsk at nswc-wo.arpa]

In a BSD4.2 system, is there a proper way to terminate a shutdown in progress?

If a command of the form: '/etc/shutdown +5' is started, interrupting does not
seem to terminate the whole process. The shutdown continues to mark out the 
time till shutdown. Killing the process leaves the /etc/nologin file in place.
A real pain if not noticed before logging out! (This needed a reboot to single
user to fix as no users were logged on). Is this the way all shutdown 
utilities work? -or- Is this a localism in dire need of fixing?

Suggestions? Opinions?

sscalsk at nswc-wo.arpa