postinst is in biff 1:0.17.pre20000412-5build1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!/bin/sh -e
if [ "$1" = "configure" ]; then
	if [ -x /usr/sbin/update-inetd ]; then
		if grep -q '^biff' /etc/inetd.conf ; then
			ENABLED=yes
		else
			ENABLED=no
		fi
		if grep -q 'biff	dgram	udp	wait	nobody.mail	/usr/sbin/in.comsat	comsat' /etc/inetd.conf ; then
			update-inetd --remove biff
		fi
		if [ "$ENABLED" = "yes" ]; then
			update-inetd --add 'biff	dgram	udp	wait	root.tty	/usr/sbin/in.comsat	comsat'
		else
			update-inetd --add '#<off># biff	dgram	udp	wait	root.tty	/usr/sbin/in.comsat	comsat'
		fi
	fi
fi
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