“Watch” is extremely easy to use, to test it, you can fire up a Linux terminal right away and type the following command: # watch free -m The interval can be easily changed to meet your requirements. By default watch re-runs the command/program every 2 seconds. This means that you will be able to see the program output in time. Watch is a Linux command that allows you to execute a command or program periodically and also shows you output on the screen. I believe everyone has different reasons for that in their daily jobs or even at home PCs and laptops. We will not stop to discuss the reasons, why you would need to run commands this often. In this tutorial, you will learn a simple scripting techniques to monitor or keep a eye on a particular command in continuously running state similar to top command (continuously monitor the process and memory utilization) for every 3 seconds by default. Believe it or not, in many cases this is too slow. In most of the cases this should work, but the shortest period which you can run cron command is every 1 minute. Often such tasks can be easily completed with simple cron commands. A system administrator often needs to run a command repeatedly in a certain periods of time.
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