OK, thanks everybody. I came up with a workaround since ^C doesn't interrupt:
$ tail /etc/rc.local
echo "============ $0:
Will execute \"${program=/etc/init.d/nodm start}\" in ${seconds=5} seconds.
Hit some chars and RET to cancel.
Hit RET to start right away."
for ((; seconds > 0; seconds--))
do
read -p $seconds.. -t 1
case $? in 0) #they hit RET...
case $REPLY in
'') break ;; #...with no other chars
*) exit 44;; #...with other chars
esac;;
esac
done
echo running $program...
$program
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