This file is indexed.

prerm is in bsdmainutils 9.0.6ubuntu3.

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

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ] ; then
	update-alternatives --remove write /usr/bin/bsd-write

	update-alternatives --remove from /usr/bin/bsd-from
fi