This file is indexed.

/etc/ppp/ip-up.d/000resolvconf is in openresolv 3.8.0-1.

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
# ppp.ip-up hook script for resolvconf
# Written by Roy Marples <roy@marples.name> under the BSD-2 license

[ -x /sbin/resolvconf ] || exit 0

if [ -n "$DNS1" -o -n "$DNS2" ]; then
	conf="# Generated by ppp.ip-up for $PPP_IFACE\n"
	[ -n "$DNS1" ] && conf="${conf}nameserver $DNS1\n"
	[ -n "$DNS2" ] && conf="${conf}nameserver $DNS2\n"
	printf "$conf" | /sbin/resolvconf -a "$PPP_IFACE"
fi