Cron Job : To automate the service down up restart

1. Write one shell script
2. Add that into cron job
3. Restart the cron service

1. /opt/folder/filename.sh

#!/bin/bash
# Grabs and kill a process from the pidlist that has the word mq

pid=`ps aux | grep api.jar | awk '{print $1}'`
kill -9 $pid


pid=`ps aux | grep api.jar | awk '{print $2}'`
kill -9 $pid

#!/bin/bash
nohup java -jar /opt/folder/api.jar & \n


2. Open  vi /etc/crontab

 > crontab -e                 //to edit cronfile

>  crontab -l                    //to list cron settings

>  crontab -d                    //to delete cron settings

# m h dom mon dow user  command

10 6,14 * * * root sh /opt/folder/filename.sh

#to store logs in custom folder

*/1 * * * * /usr/bin/python3 /opt/drvijay/applications/backend/testcorn.py >> /opt/drvijay/logs/testcorn.log 2>&1

3. Run
service cron stop
service cron start

To see system log or custom log

grep CRON /var/log/syslog
tail -f /var/log/syslog | grep CRON

tail -f /opt/drvijay/logs/testcorn.log

it will run 6:10 AM, 2:10 PM.