This file is indexed.

postrm is in isc-dhcp-client-ddns 4.3.5-3ubuntu7.

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" -o "$1" = "abort-install" -o "$1" = "disappear" ]; then
        dpkg-divert --package isc-dhcp-client-ddns --remove \
		--rename --divert /sbin/dhclient-noddns /sbin/dhclient
fi