This file is indexed.

preinst is in isc-dhcp-server 4.1.ESV-R4-0ubuntu5.10.

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 dpkg --compare-versions "$2" lt 4.0 &&
  [ -f /etc/default/dhcp3-server ] &&
  [ ! -f /etc/default/isc-dhcp-server ]; then
    echo "Copying /etc/default/dhcp3-server to /etc/default/isc-dhcp-server"
    cp /etc/default/dhcp3-server /etc/default/isc-dhcp-server
fi

# Automatically added by dh_installinit
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/isc-dhcp-server" ] && [ ! -L "/etc/init.d/isc-dhcp-server" ]; then
		if [ "`md5sum \"/etc/init.d/isc-dhcp-server\" | sed -e \"s/ .*//\"`" != \
		     "`dpkg-query -W -f='${Conffiles}' isc-dhcp-server | sed -n -e \"\\\\' /etc/init.d/isc-dhcp-server '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			echo "Obsolete conffile /etc/init.d/isc-dhcp-server has been modified by you, renaming to .dpkg-bak"
			mv -f "/etc/init.d/isc-dhcp-server" "/etc/init.d/isc-dhcp-server.dpkg-bak"
		else
			rm -f "/etc/init.d/isc-dhcp-server"
		fi
	fi
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/init.d/isc-dhcp-server6" ] && [ ! -L "/etc/init.d/isc-dhcp-server6" ]; then
		if [ "`md5sum \"/etc/init.d/isc-dhcp-server6\" | sed -e \"s/ .*//\"`" != \
		     "`dpkg-query -W -f='${Conffiles}' isc-dhcp-server | sed -n -e \"\\\\' /etc/init.d/isc-dhcp-server6 '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			echo "Obsolete conffile /etc/init.d/isc-dhcp-server6 has been modified by you, renaming to .dpkg-bak"
			mv -f "/etc/init.d/isc-dhcp-server6" "/etc/init.d/isc-dhcp-server6.dpkg-bak"
		else
			rm -f "/etc/init.d/isc-dhcp-server6"
		fi
	fi
fi
# End automatically added section