This file is indexed.

/etc/network/if-down.d/51guidedog is in guidedog 1.2.0-3.

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 we are being called by ifupdown when it changes a PPP interface,
# and if the appropriate file is in place to do this for PPP anyway,
# don't do anything.
[ -x /etc/ppp/ip-up.d/51guidedog -a "$MODE" = "start" -a "$METHOD" = "ppp" ] && exit 0
[ -x /etc/ppp/ip-down.d/51guidedog -a "$MODE" = "stop" -a "$METHOD" = "ppp" ] && exit 0

# setup guidedog
if [ -x /etc/rc.guidedog ]; then
  /bin/sh /etc/rc.guidedog
fi