This file is indexed.

prerm is in util-linux 2.27.1-6ubuntu3.

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

case "$1" in
	remove)
		update-alternatives --remove pager /bin/more
		update-alternatives --remove pager /usr/bin/pg
		;;

	upgrade|failed-upgrade|deconfigure)
		;;

esac