This file is indexed.

prerm is in libapache2-mod-auth-sys-group 1.1.1-9.

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" ] || [ "$1" = "purge" ]; then
    if [ -e /etc/apache2/apache2.conf ]; then
        a2dismod auth_sys_group || true
    fi
fi

exit 0