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This chapter has covered taking complete control of your system. You looked at what processes are, how they re separate from programs, and how they can be controlled or viewed by using programs such as top and ps. In addition, you explored job management under BASH. You saw that you can stop, start, and pause programs at your convenience. In the next chapter, we take a look at several tricks and techniques that you can use with the BASH shell to finely hone your command-line skills.

The questions in the previous sections were all quite easy to answer once we realized we needed a self join. Sometimes, however, these realizations don t always come when you need them. Whenever my mind goes blank when faced with a query, I always resort to a calculus approach.

Notice that more than one alternative is used on most lines, which makes it easier to handle typos and other situations where the user hasn t typed exactly what you were expecting him to type Then on separate lines come all the commands that you want the script to execute In the example, just one command is executed, but you can enter a hundred lines to execute commands if you like Finally, the test is closed by using ;; Don t forget to close all items with the double semicolons; otherwise, the script won t understand you The ;; can be on a line by itself, but you can also put it directly after the last command line in the script When using case, you should make it a habit to handle all other options Hopefully, your user will enter something that you expect.

As you learn in 1, strictly speaking, the word Linux refers to just the kernel, which is the fundamental, invisible program that runs your PC and lets everything happen. However, on its own, the kernel is completely useless. It needs programs to let users interact with the PC and do cool stuff, and it needs a lot of system files (also referred to as libraries) to provide vital functions. The GNU Project provides many of these low-level pieces of code and programs. This is why many people refer to the Linux OS as GNU/Linux, acknowledging that without the GNU components Linux wouldn t have gotten off the starting blocks. The GNU Project provides various shell programs too. A shell is what the user interacts with on a day-to-day basis, whether by mouse or keyboard. The word originates from the fact that the shell is the outer layer of the OS, which encapsulates the kernel (and in some instances protects it by filtering out bad user commands). Some shells offer graphical functionality but, in general, the word shell is understood to mean text-only interfaces. These text shell programs are also known as terminal programs, and they re often colloquially referred to as command-line prompts, in reference to the most important component they provide. This kind of shell lets you take control of your system in a quick and efficient way. Although using the shell is not strictly necessary nowadays, because almost everything can be done in Ubuntu using the graphical interface, it remains true that by using the shell you become the true master of your own system. This appendix introduces the BASH shell, which is the default shell on Ubuntu systems.