- https://www.digitalocean.com/community/tutorials/how-to-use-cron-to-automate-tasks-centos-8
- https://phoenixnap.com/kb/how-to-list-display-view-all-cron-jobs-linux
- https://en.wikipedia.org/wiki/Cron
- https://ostechnix.com/a-beginners-guide-to-cron-jobs/
- https://phoenixnap.com/kb/set-up-cron-job-linux
- https://askubuntu.com/questions/417122/running-php-cron-job-with-arguments
