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===Part 2: Using crontab to Alert System Administrator of Low Hard Disk Space===
This emphasis on this section focuses on how to automatically run useful shell scripts or without the Linux system administrator being there to issue that shell script that we have created at specific dates/times. It would be silly highly unlikely to expect a system administrator to stay up late (eg. 2 a.m.) to manually run a shell script to terminate processes or to re-boot Linux servers. Database files (tables) are used to provide instructions on how frequent shell scripts or commands can be run.
The '''cron''' daemon is used to refer to these files and to run them on a pre-determined basis. The term '''cron''' comes from the old word '''chronograph''' meaning a special type of watch (actually a ''stop-watch'') to help monitor and schedule routine tasks.
