This file is indexed.

/usr/bin/sbuild-upgrade is in sbuild 0.75.0-1ubuntu1.

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/perl -w
#
# Copyright © 2006-2008 Roger Leigh <rleigh@debian.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
#######################################################################

use strict;
use warnings;

print "$0 is deprecated. Use sbuild-update --upgrade directly instead.\n";
exec("sbuild-update", "--upgrade", @ARGV) or
    die "Can't run sbuild-update: $!";