This file is indexed.

/etc/dhcp/dhclient-exit-hooks.d/zzz_avahi-autoipd is in avahi-autoipd 0.6.31-4ubuntu1.

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

# This file is part of avahi.
#
# avahi is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# avahi is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with avahi; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA.

case "$reason" in
    MEDIUM|ARPCHECK|ARPSEND|NBI)
        ;;

    PREINIT|BOUND|RENEW|REBIND|REBOOT|STOP|RELEASE)
        # Stopping avahi-autoipd is left for the enter hook
        ;;

    EXPIRE|FAIL|TIMEOUT)
        /usr/sbin/avahi-autoipd -wD $interface 2> /dev/null
        ;;
esac