config is in bitlbee-common 3.0.4+bzr855-1.
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 21 22 23 24 25 26 27  | #!/bin/sh
set -e
. /usr/share/debconf/confmodule
[ -f /etc/default/bitlbee ] && . /etc/default/bitlbee
db_title BitlBee
if [ -n "$BITLBEE_PORT" ]; then
	db_set bitlbee/serveport "$BITLBEE_PORT"
else
	db_get bitlbee/serveport
	if [ "$RET" = "stillhavetoask" ]; then
		listens=$(netstat -ltn | awk '{print $4}')
		for port in 6667 6666 6668 6669; do
			if [ $(expr "$listens " : ".*:$port\s") = "0" ]; then
				break
			fi
		done
		db_set bitlbee/serveport $port;
	fi
fi
if db_input medium bitlbee/serveport; then
	db_go;
fi
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