This file is indexed.

postinst is in libpam-cracklib 1.1.8-3.2ubuntu2.

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 1.0.1-6; then
	pam-auth-update --package
fi