prerm 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 | #!/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
else
invoke-rc.d bitlbee stop || exit 0
fi
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