9. Functions

This chapter describes awk's built-in functions, which fall into three categories: numeric, string, and I/O. gawk provides additional groups of functions to work with values that represent time, do bit manipulation, and to internationalize and localize programs.

Besides the built-in functions, awk has provisions for writing new functions that the rest of a program can use. The second half of this chapter describes these user-defined functions.

9.1 Built-in Functions		Summarizes the built-in functions.
9.2 User-Defined Functions		Describes User-defined functions in detail.