prerm is in bitlbee-common 3.5.1-1build1.
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 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ]; then
	## To prevent the help function from breaking in currently running
	## BitlBee processes. Have to do it like this because dpkg-reconfigure
	## looks a lot like an upgrade and we don't want to lose help.txt...
	if [ -e /usr/share/bitlbee/help.txt ]; then
		rm -f /usr/share/bitlbee/help.upgrading
		mv /usr/share/bitlbee/help.txt /usr/share/bitlbee/help.upgrading
	fi
fi
# Automatically added by dh_installinit/10.6.4ubuntu1
if [ -x "/etc/init.d/bitlbee" ]; then
	invoke-rc.d bitlbee stop || exit $?
fi
# End automatically added section
 |