This file is indexed.

/usr/share/sendmail/cf/ostype/unknown.m4 is in sendmail-cf 8.15.2-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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divert(-1)
#
# Copyright (c) 1998, 1999 Proofpoint, Inc. and its suppliers.
#	All rights reserved.
# Copyright (c) 1983 Eric P. Allman.  All rights reserved.
# Copyright (c) 1988, 1993
#	The Regents of the University of California.  All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#

divert(0)
VERSIONID(`$Id: unknown.m4,v 8.10 2013-11-22 20:51:15 ca Exp $')
errprint(`*** ERROR: You have not specified a valid operating system type.')
errprint(`	Use the OSTYPE macro to select a valid system type.  This')
errprint(`	is necessary in order to get the proper pathnames and flags')
errprint(`	appropriate for your environment.')