This file is indexed.

/usr/sbin/dnssec-checkds is in bind9utils 1:9.11.3+dfsg-1ubuntu1.

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

The actual contents of the file can be viewed below.

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#!/usr/bin/python3
############################################################################
# Copyright (C) 2012-2017  Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
############################################################################

import os
import sys

sys.path.insert(0, os.path.dirname(sys.argv[0]))
if os.name != 'nt':
    if '': # value of --with-python-install-dir
        sys.path.insert(1, '')
    else:
        sys.path.insert(1, os.path.join('/usr', 'lib',
                        'python' + sys.version[:3], 'site-packages'))

import isc.checkds

if __name__ == "__main__":
    isc.checkds.main()