File check_disks of Package nagios-plugins-disks

#!/bin/bash
CHECK_MULTI_CMD_FILE="/tmp/check_disks.cmd"
CNT=0

rm -rf ${CHECK_MULTI_CMD_FILE}

for a in `grep -E '(xfs|ext2|ext3|ext4|btrfs|reiserfs|vfat|tmpfs|vzfs)' /proc/mounts | awk '{print $1}' | grep ^/ | grep -v -E '(^/vz/template:|^/dev$)' | sort -u` ; do
 b=`readlink -e ${a}`
 if [ "`mount | grep ^${b} | wc -l`" == "1" ] ; then
  a=${b}
 fi
 if [ -d /etc/nagios/check_disks/ ] ; then
  b=`echo ${a} | sed -e s@"/"@"_"@g`
  if [ -s /etc/nagios/check_disks/${b} ] ; then
        # format is 20%:10%
        warn=`cat /etc/nagios/check_disks/${b} | awk -F: '{print $1}'`
        crit=`cat /etc/nagios/check_disks/${b} | awk -F: '{print $2}'`
	iwarn=`cat /etc/nagios/check_disks/${b} | awk -F: '{print $3}'`
	icrit=`cat /etc/nagios/check_disks/${b} | awk -F: '{print $4}'`
        if [ -z "${warn}" ] || [ -z "${crit}" ] ; then
                warn="20%"
                crit="10%"
        fi
	if [ -z "${iwarn}" ] || [ -z "${icrit}" ] ; then
		iwarn="20%"
		icrit="10%"
	fi
  else
        warn="20%"
        crit="10%"
	iwarn="20%"
	icrit="10%"
  fi
 else
	warn="20%"
	crit="10%"
	iwarn="20%"
	icrit="10%"
 fi
 echo "command[check_disk_${CNT}]=/usr/lib/nagios/plugins/check_disk -w ${warn} -c ${crit} -W ${iwarn} -K ${icrit} -p ${a}" >> ${CHECK_MULTI_CMD_FILE}
 CNT=`expr ${CNT} + 1`
done
if [ -x /usr/lib/nagios/plugins/check_multi ] ; then
        if [ -f ${CHECK_MULTI_CMD_FILE} ] ; then
                /usr/lib/nagios/plugins/check_multi -f ${CHECK_MULTI_CMD_FILE} -s dont_be_paranoid=1 --report 520
        else
                if [ -x /usr/lib/nagios/plugins/check_disk ] ; then
                        /usr/lib/nagios/plugins/check_disk -w 20% -c 10% -W 20% -K 10% -p /
                else
                        echo "Couldn't find any valid filesystem to check and i'm unable to execute check_disk plugin"
                        exit 2
                fi
        fi
else
        echo "Plugin: /usr/lib/nagios/plugins/check_multi not executable"
        exit 2
fi