This file is indexed.

/usr/sbin/update-bootsystem-insserv is in insserv 1.14.0-2.1ubuntu2.

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
#
# Author: Petter Reinholdtsen
# Date: 2009-08-04
#
# Transition script only to be used by sysv-rc version 2.87dsf-2 if
# insserv is upgraded without sysv-rc being upgraded too.

set -e

case "$1" in
    enable|'')
	exit 0
	;;
    check)
	exit 1
	;;
    *)
	echo "error: Unknown argument '$1'"
	exit 1
	;;
esac

exit 0