In this chapter, we learned about the different types of variables that are available in AWK. We learned how to use built-in variables and environment variables in AWK programs. Then we learned about the usage of environment variables specific to GAWK. Finally, we looked at the string constants and numeric constants from an AWK perspective, and at how the conversion of string to numeric values, and numeric to string values, takes place in AWK.
In our next chapter, we will learn about how to handle arrays in AWK programs.