This file is indexed.

/etc/ppp/ip-down.d/netscript is in netscript-2.4 5.2.9ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
[ ! -x /sbin/tc ] && exit 0
. /etc/netscript/network.conf
. /etc/netscript/qos.conf

ip_QoSclear $PPP_IFACE