This file is indexed.

prerm is in blackbox 0.70.1-23+deb8u1.

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

case "$1" in
    remove)
        update-alternatives --remove x-window-manager /usr/bin/blackbox
	;;
    *)
        ;;
esac