This file is indexed.

prerm is in libapache2-mod-parser3 3.4.1-3ubuntu1.

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
    a2dismod -q -f parser3 || true
    invoke-rc.d apache2 restart
fi