This file is indexed.

/usr/lib/lbdb/m_mu is in lbdb 0.46.

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
#
# -*-sh-mode-*-
#
#     Copyright (C) 2018      Timothy Bourke <tim@tbrk.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, write to the Free Software Foundation,
#     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,, USA.

m_mu_query()
{
    MU=/usr/bin/mu
    MU_OPTIONS=

    if [ "$MU_AFTER" -eq "$MU_AFTER" ] 2>/dev/null # test integer
    then
	MU_OPTIONS="$MU_OPTIONS --after=$MU_AFTER"
    fi

    if [ "$MU_PERSONAL" = "yes" ] || [ "$MU_PERSONAL" = "true" ]
    then
	MU_OPTIONS="$MU_OPTIONS --personal"
    fi

    if [ -x "$MU" ]                # check whether mu is installed
    then
	$MU cfind --format=csv $MU_OPTIONS "$@" \
        | sed -e '/^,/d' -e 's/\(.*\),\([^,]*\)/\2	\1	mu cfind/'
    fi
}