/usr/share/sendmail/cf/feature/smrsh.m4 is in sendmail-cf 8.14.4-4.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 1998, 1999 Sendmail, 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: smrsh.m4,v 8.14 1999/11/18 05:06:23 ca Exp $')
divert(-1)
ifdef(`_MAILER_local_',
`errprint(`*** FEATURE(smrsh) must occur before MAILER(local)
')')dnl
define(`LOCAL_SHELL_PATH',
ifelse(defn(`_ARG_'), `',
ifdef(`confEBINDIR', confEBINDIR, `/usr/libexec')`/smrsh',
_ARG_))
_DEFIFNOT(`LOCAL_SHELL_ARGS', `smrsh -c $u')
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