This file is indexed.

/etc/ppp/ip-up.d/exim4 is in exim4-config 4.76-3ubuntu3.

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

if [ -n "$EX4DEBUG" ]; then
  echo "now debugging $0 $@"
  set -x
fi

[ -x /usr/lib/exim4/exim4 ] || exit 0

[ -f /etc/default/exim4 ] && . /etc/default/exim4

if [ "${QUEUERUNNER}" != "no" ] ; then
# Flush exim queue
	/usr/sbin/exim4 -qqf ${QUEUERUNNEROPTIONS} ${COMMONOPTIONS}
fi