This file is indexed.

prerm is in libpam-pwquality 1.3.0-0ubuntu1.

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
    pam-auth-update --package --remove pwquality
fi