Everything in UNIX is either a file or a process. `% cat file1.xx` (concatenate) show the content of the file on the screen `% less file1.xx` show one page of the file on the screen at a time, press ...

Make sure the script has executable permissions by running the command: chmod +x system_monitoring.sh. "httpd" process is chosen as a sample service / process. Threshold for memory / CPU / disk usage ...