postrm 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 | #!/bin/sh
set -e
[ "$1" = "purge" ] || exit 0
if [ -e /usr/share/debconf/confmodule ]; then
. /usr/share/debconf/confmodule;
db_purge;
fi
update-rc.d bitlbee remove > /dev/null 2>&1 || true
rm -f /etc/default/bitlbee
deluser --system --remove-home bitlbee || true
rm -rf /var/lib/bitlbee ## deluser doesn't seem to do this for homedirs in /var
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