get jvm heap usage with shell

jvm_heap_usage.sh

#!/bin/bash

pidVal=$( ps -ef | grep "/data/www/tomcat-unifymonitor/conf/logging.properties -" | grep -v grep | awk -F' ' '{print $2}' | tr "\n" "," | cut -d ',' -f1 )

capacityLine=$(/usr/java/jdk1.7.0_65/bin/jstat -gccapacity ${pidVal}  | tail -n 1 )
percentageLine=$(/usr/java/jdk1.7.0_65/bin/jstat -gcutil ${pidVal}  | tail -n 1)
memValReal=`gawk -v v1="$capacityLine" -v v2="$percentageLine"  'BEGIN{
    split(v1,cArray," ");
    split(v2,pArray," ");
    sum=0.0;
# S0C Current Usage = S0C*S0/100.0
    sum=sum + (cArray[4]*pArray[1]/100.0);
# S1C Current Usage = S1C*S1/100.0
    sum=sum + (cArray[5]*pArray[2]/100.0);
# Eden Current Usage = EC*E/100.0
    sum=sum + (cArray[6]*pArray[3]/100.0);
# Old Current Usage = OC*O/100.0
    sum=sum + (cArray[9]*pArray[4]/100.0);
    sum=sum/1000000;
    printf "%.2f\n",sum;
}'`
echo $memValReal

standardVal=3.0
if [ $(echo "$memValReal > $standardVal" | bc) -eq 1 ];then
     echo $memValReal
fi