This is very simple but very powerful. Within Linux you can create programs that are always executing or running silently in the background. These are called Daemons and they do everything from wake up a computer when a mouse is moved, automatically backup a server or in this case it can monitor a server 24/7 and send alerts when it notices anything suspicious or out of line.
Below I created a simple Daemon that monitors the disk space utilization and it sends emails to an account at tester@slabj.com which is the domain for the test server this is created on.
In essence an infinite loop is created and when a predefined threshold is crossed the server sends an email message to alert the administrator. The rest of the process is identical to what I covered in monitoring memory usage in this way so I won't go over that again but you can look at that article here for more clarity: https://jgardnerla.blogspot.com/2020/04/cron-job-daemon-shell-script-to-send.html.
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