Howto get combined average Load of multi core CPU by BASH

Small script to acquire combined cpu load (average) from remote server. I required to acquire ESXI multicore cpu load to plot mrtg graph.

#!/bin/bash
# Script to query ESXI server
#set -x
HOST="$1"
SNMP_STRING="public"
TMP_HOLDER="/tmp/cpuinfo.$HOST"
OID="hrProcessorLoad."
MIB="/cfg/mibs/HOST-RESOURCES-MIB"
snmpwalk -v2c -c $SNMP_STRING -m "$MIB" $HOST |grep $OID | awk '{print $4}' > $TMP_HOLDER
CPU_CORE=`cat $TMP_HOLDER | wc -l`
CPU_LOAD_SUM=`cat $TMP_HOLDER | awk '{ sum += $1 } END { print sum }'`
CPU_LOAD_FINAL=`echo "scale=2; $CPU_LOAD_SUM/$CPU_CORE" | bc -l`
echo $CPU_LOAD_FINAL
echo $CPU_LOAD_FINAL

Result:

(following result is average value of my esxi server which have 2 physical processor with 6 cores each, so virtually there are 24 cores for ESXI)

root@linux:/temp# ./cpu_load.sh 10.0.0.1

6.70
6.70

CFG example:

ESXI Server -10.0.0.1- CPU Utilization ###
Target[esxi_cpu_1010.0.0.1]: `/temp/cpu_load.sh 10.0.0.1`
Options[esxi_cpu_1010.0.0.1]: growright, gauge, integer, noo
MaxBytes[esxi_cpu_1010.0.0.1]: 100
LegendI[esxi_cpu_1010.0.0.1]: Total CPU Cores Used %
LegendO[esxi_cpu_1010.0.0.1]:
Legend1[esxi_cpu_1010.0.0.1]: Total CPU Cores Used %
Legend2[esxi_cpu_1010.0.0.1]:
Title[esxi_cpu_1010.0.0.1]: ESXI Server -10.0.0.1- CPU Load %
PageTop[esxi_cpu_1010.0.0.1]: <h1>ESXI Server -10.0.0.1- CPU Load %</h1>
Unscaled[esxi_cpu_1010.0.0.1]: ymwd
ShortLegend[esxi_cpu_1010.0.0.1]: %
YLegend[esxi_cpu_1010.0.0.1]: % CPU Used
Colours[esxi_cpu_1010.0.0.1]: RED#ff4f27,DIRTY YELLOW#E6B420,RED#ff4f27,DIRTY YELLOW#E6B420

J.