Nagios check fortimail queue

#!/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   : 08/01/2018"
echo "#   Version        : 1.0"
echo "#   Information    : Check FortiMail Queues and message counts in each queue"
echo "#   Usage          : $0 -H host -C community -w warning_count -c critical_count"
echo "####################################################################"
echo
}

while getopts ":H:C:w:c:" opt; do
  case $opt in
	H) HOST="$OPTARG"
	;;
	C) SNMP_COMMUNITY="$OPTARG"
	;;
	w) WARN="$OPTARG"
	;;
	c) CRIT="$OPTARG"
	;;
    	\?) USAGE
    	;;
  esac
done

if [ "$HOST" == "" ] || [ "$SNMP_COMMUNITY" == "" ] || [ "$WARN" == "" ] || [ "$CRIT" == "" ]; then
	USAGE
	exit 0
fi

EXIT_CODE=0
QUEUES=$(snmpwalk -On -v2c -c $SNMP_COMMUNITY $HOST .1.3.6.1.4.1.12356.105.1.103.2.1.1 | awk '{print $4}')

for QUEUE in $QUEUES; do
	QUEUE_NAME=$(snmpget -On -v2c -c $SNMP_COMMUNITY $HOST .1.3.6.1.4.1.12356.105.1.103.2.1.2.$QUEUE | awk -F\" '{print $2}')
	QUEUE_COUNT=$(snmpget -On -v2c -c $SNMP_COMMUNITY $HOST .1.3.6.1.4.1.12356.105.1.103.2.1.3.$QUEUE | awk '{print $4}')
	if [[ $QUEUE_COUNT -ge $CRIT ]]; then
		echo "CRITICAL - $QUEUE_NAME: $QUEUE_COUNT messages"
		EXIT_CODE=2
	elif [[ $QUEUE_COUNT -ge $WARN ]]; then
		echo "WARNING - $QUEUE_NAME: $QUEUE_COUNT messages"
		if [ ${EXIT_CODE} -eq 0 ]; then
                        EXIT_CODE=1
                fi
	else
		echo "OK - $QUEUE_NAME: $QUEUE_COUNT messages"
	fi
done

IFS=$SAVEIFS
exit $EXIT_CODE