This file is indexed.

/usr/bin/count_unknown_ext is in sloccount 2.26-5.

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

# This reports a sorted list of the "unknown" file extensions
# analyzed by a previous run of SLOCCount, most common first.
# Use this to make sure that there isn't a common language type
# that you are NOT counting.

# This is part of SLOCCount, a toolsuite that counts
# source lines of code (SLOC).
# Copyright (C) 2001-2004 David A. Wheeler.
# 
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
# 
# To contact David A. Wheeler, see his website at:
#  http://www.dwheeler.com.


find ${HOME}/.slocdata -name 'unknown_list.dat' -exec cat {} \; | \
   count_extensions  | less