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