Java Memory Usage

gistfile1.txt

#!/bin/sh

if [ -z "$1" ]
then
    echo "Usage: $0 <java process name>"
    exit 1
fi

PID=`jps | grep $1 | awk '{print \$1}'`
jmap -heap $PID 2>/dev/null > /tmp/jheap

CAPACITY=`grep capacity /tmp/jheap | grep = | awk  '{TOTAL += $3} END{print TOTAL}'`
USED=`grep used /tmp/jheap | grep = | awk  '{TOTAL += $3} END{print TOTAL}'`

PERCENT=$(( $USED * 100 / $CAPACITY ))
echo total:$CAPACITY used:$USED percent used:$PERCENT