This file is indexed.

postinst 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

reload_apache()
{
    if apache2ctl configtest 2>/dev/null; then
        invoke-rc.d apache2 force-reload || true
    else
        echo "Your apache2 configuration is broken, so we're not restarting it for you."
    fi
}

if [ -n "$2" ]; then
    # we're upgrading. test if we're enabled, and if so, restart to reload the module.
    if [ -e /etc/apache2/mods-enabled/auth_sys_group.load ]; then
        reload_apache
    fi
    exit 0
elif [ -e /etc/apache2/apache2.conf ]; then
    a2enmod auth_sys_group >/dev/null || true
    reload_apache
fi

exit 0