This file is indexed.

preinst is in libdlm3 3.1.7-0ubuntu2.

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" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/udev/rules.d/45-dlm.rules" ]; then
		if [ "`md5sum \"/etc/udev/rules.d/45-dlm.rules\" | sed -e \"s/ .*//\"`" = \
		     "`dpkg-query -W -f='${Conffiles}' libdlm3 | sed -n -e \"\\\\' /etc/udev/rules.d/45-dlm.rules's/.* //p\"`" ]
		then
			rm -f "/etc/udev/rules.d/45-dlm.rules"
		fi
	fi
fi