This file is indexed.

postrm is in isc-dhcp-server-ldap 4.3.5-3+deb9u1.

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 ]; then
	dpkg-divert --package isc-dhcp-server-ldap --remove --rename \
		--divert /usr/sbin/dhcpd-noldap /usr/sbin/dhcpd
fi