This file is indexed.

/usr/share/checksecurity/check-diskfree is in checksecurity 2.0.16+nmu1.

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
# 
# Check-diskfree checksecurity plugin
#
# This script is designed to analyse the usage of the different
# disks in the system.
#
# It is part of the 'checksecurity' package, and tests may be configured
# by the global file '/etc/checksecurity.conf' and the file
# '/etc/checksecurity/check-diskfree.conf'.
#
# Copyright (C) 2003-2005 Steve Kemp <skx@debian.org>
#
# Licensed under the GNU General Public License
#
# 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.

# Sane default, just in case
[ -z "$CHECK_DISK_PERCENT" ] && CHECK_DISK_PERCENT=90
[ -z "$LOGDIR" ] && LOGDIR=/var/log

# Temporary file
[ ! -d /var/run/checksecurity ] && { umask 022; mkdir -p /var/run/checksecurity; }
TMPDF=/var/run/checksecurity/diskfree.log.tmp
>$TMPDF


df -klP |
grep ^/ |
grep -v /media/ |
sed -e 's/.*[[:space:]]\([[:digit:]]\+\)%/\1/' |
while read PERC LOCATION; do
 if [ "$PERC" -gt "$CHECK_DISK_PERCENT"  ]; then
  echo "Usage warning on $CHECK_DISK_PERCENT"  >>$TMPDF
  echo "${PERC}% ALERT - $LOCATION"  >>$TMPDF
 fi
done 

# The default behaviour is to output to stdout
cat $TMPDF

if [ -s "$TMPDF" ] && [ ! -z "$CHECKSECURITY_EMAIL" ]; then
  /usr/bin/mail -s "Diskfree alert for `hostname -f` on `date '+%D %T'`" $CHECKSECURITY_EMAIL < $TMPDF
fi


mv $TMPDF $LOGDIR/diskfree.log

exit 0