prerm is in rabbitmq-server 2.8.4-1.
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.
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#!/bin/sh set -e # Automatically added by dh_installinit if [ -x "/etc/init.d/rabbitmq-server" ]; then invoke-rc.d rabbitmq-server stop || exit $? fi # End automatically added section