Nagios check juniper virtual chassis

!/bin/bash

SAVEIFS=$IFS
IFS=$(/bin/echo -en "\n\b")
function USAGE {
echo
echo "####################################################################"
echo "#   File name      : nagios_check_juniper_virtual_chassis"
echo "#   Created by     : Tim Price - Initech Consulting ( for any questions contact me on tim@initech.nz )"
echo "#   Created date   : 14/04/2017"
echo "#   Version        : 1.0"
echo "#   Information    : Check Juniper EX series switch virtual chassis members are all present and running"
echo "#                  : the same junos version"
echo "#   Usage          : $0 -H host -C community -c vc-count"
echo "####################################################################"
echo
}
while getopts ":H:C:c:" opt; do

 case $opt in

	H) HOST="$OPTARG"
	;;
	C) SNMP_COMMUNITY="$OPTARG"
	;;
	c) VC_COUNT="$OPTARG"
	;;

   	\?) USAGE
   	;;
 esac

done
if [ "$HOST" == "" ] || [ "$SNMP_COMMUNITY" == "" ] || [ "$VC_COUNT" == "" ]; then
	USAGE
	exit 0
fi
TOTAL_VERSIONS=0
TOTAL_SWITCHES=0
for LINE in `snmpwalk -On -v2c -c $SNMP_COMMUNITY $HOST 1.3.6.1.4.1.2636.3.40.1.4.1.1.1.5 | awk '{print $4}' | uniq -c`; do
	NUMBER=`echo $LINE | awk '{print $1}'`
	TOTAL_SWITCHES=$(($TOTAL_SWITCHES + $NUMBER))
	TOTAL_VERSIONS=$(($TOTAL_VERSIONS + 1))
done
if [ $TOTAL_VERSIONS -gt 1 ]; then
	echo "CRITICAL - Virtual chassis contains switches with $TOTAL_VERSIONS different junos versions"
	IFS=$SAVEIFS
	exit 2
fi
if [ $TOTAL_SWITCHES -ne $VC_COUNT ]; then
	echo "CRITICAL - Only $TOTAL_SWITCHES virtual chassis switch member(s) present, $VC_COUNT are expected"
	IFS=$SAVEIFS
	exit 2
fi

echo "OK - $VC_COUNT virtual chassis switch member(s) present, all running the same junos version" IFS=$SAVEIFS exit 0