After reading this chapter, you understood how to write simple shell script in bash by printing, echoing, and asking user input. You should now have a good understanding of defining and using variables in shell and what builtin shell variables exist. You are now familiar with what operators are available in shell and how they can create and evaluate their own expression. With information about wildcards available in this chapter, it makes work easier for you while you are dealing with similar kind of data or pattern. The shell builtin command set enables modifying shell variables easily.

This chapter has built a foundation for upcoming chapters. Now, in next chapter, you will get to know about standard inputs, outputs, and errors. Also, there will be a detailed coverage of how to use an output from commands and then filter/transform them to show the data according to your need.