Another command that is very useful for system administration is the watch command. Even better is the fact that the watch command is extremely easy to learn as what it does is simple. It repeats the command typed immediately after it every two seconds by default. For example, you can view the output of the ls command every two seconds by typing the following command:

watch ls /home/user

This is not very exciting, is it? To illustrate what ls does, open another terminal window. In that window, create a new file in your home directory. You should see the new file appear in the output of the first window. If you delete the file, you'll see the file disappear from the watch output.

While this may be useful for monitoring a single directory, it may not be a very exciting example. For an even better example, try the following command:

sensors

As long as your motherboard supports it, the sensors command...