Create CSV of running java processes and their memory usage

listJavaDUMemoryAsCsv.sh

#!/bin/bash
#
# Description: Create CSV of running java processes and their memory usage
#       this script must be run as the same user as the java processes you want to capture
#
# Author: David McElligott<[email protected]> 10/5/2016
#

user="$(whoami)"

header=""
header="Server, App Name, Java Version, Metaspace Used (kb), Metaspace Total (kb), Metaspace Used (%), Permgen Used (kb), Permgen Total (kb), Permgen Used (%), Command Error"
echo $header
for pid in $(pgrep -x java -u $user); do
        meta_space_total=""
        meta_space_used=""
        meta_space_percentage=""
        permgen_space_total=""
        permgen_space_used=""
        permgen_space_percentage=""
        run_status=""

        cmdline="$(cat /proc/$pid/cmdline)"
        java_home="$(echo $cmdline |  grep -aoP '(?<=).*/java../.*?(?=/bin/java|/jre)')"
        java_home="$(readlink -f $java_home)"
        java_version="$(basename $java_home)"
        app_name="$(echo $cmdline |  grep -oP '(?<=-Dapp.name=).*?(?=-D)')"
        if [[ "$app_name" == "" ]]; then
                app_name="$(echo $cmdline |  grep -oP '(?<=-Djbs.name=).*?(?=-D)')"
        fi
        row="$HOSTNAME"
        row="$row, $app_name"
        row="$row, $java_version"

        jstat_output=$($java_home/bin/jstat -gc $pid 2>/dev/null)
        if [ "$?" != "0" ]; then
                run_status="FAILED: jstat Could not attach to $pid"
        else
                jstat_data="$(printf "$jstat_output" | tail -n 1 2> /dev/null)"
                if [[ "$java_version" == *"jdk1.8"* ]]; then
                        meta_space_total="$(echo $jstat_data | awk '{print $9}')"
                        meta_space_used="$(echo $jstat_data | awk '{print $10}')"
                        meta_space_percentage="$(echo "scale=2; $meta_space_used*100/$meta_space_total" | bc -l)"
                else
                        permgen_space_total="$(echo $jstat_data | awk '{print $9}')"
                        permgen_space_used="$(echo $jstat_data | awk '{print $10}')"
                        permgen_space_percentage="$(echo "scale=2; $permgen_space_used*100/$permgen_space_total" | bc -l )"
                fi
        fi
        row="$row, $meta_space_used, $meta_space_total, $meta_space_percentage, $permgen_space_used, $permgen_space_total, $permgen_space_percentage, $run_status"
        echo $row
done