Shell Programming and Scripting

#!/bin/sh
#A script to log the cpu and memory usage of linux processes namely - redis, logstash, elasticsearch and kibana

REDIS_PID=$(ps -ef | grep redis | grep -v grep | awk '{print $2}')

LOGSTASH_PID=$(ps -ef | grep logstash | grep -v grep | awk '{print $2}')

ELASTICSEARCH_PID=$(ps -ef | grep elasticsearch | grep -v grep | awk '{print $2}')

KIBANA_PID=$(ps -ef | grep kibana | grep -v grep | awk '{print $2}')

LOG_FILE=/var/log/user/usage.log
echo $LOG_FILE
top -b | awk -v redis="$REDIS_PID" -v logstash="$LOGSTASH_PID" '/redis|logstash/ {print $1","$9","$10","$12}'

top -b | awk -v logfile=/tmp/log.txt '
{
	if($1 == "PID")
	{
		command="date +%T";
		command | getline ts
		close(command);
	}
	if($12 == "redis" || $12 == "logstash" || $12 == "elasticsearch" || $12 == "kibana")
	{
		printf "%s,%s,%s,%s,%s\n",ts,$1,$9,$10,$12 > logfile
	}
}'

top -b | awk -v redis="$REDIS_PID" -v logstash="$LOGSTASH_PID" '
    $12 ~ redis || $12 ~ logstash {print $1","$9","$10","$12}'

top -b | awk -v redis="$REDIS_PID" -v logstash="$LOGSTASH_PID" -v logtime="$(date +%T)" '
    $12 ~ redis || $12 ~ logstash {print logtime","$1","$9","$10","$12}'