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awk programs can often be simplified by defining
your own functions. User-defined functions can be called just like
built-in ones (see section 6.13 Function Calls), but it is up to you to define
them, i.e., to tell
awk what they should do.
9.2.1 Function Definition Syntax How to write definitions and what they mean. 9.2.2 Function Definition Examples An example function definition and what it does. 9.2.3 Calling User-Defined Functions Things to watch out for. 9.2.4 The
Specifying the value a function returns. 9.2.5 Functions and Their Effects on Variable Typing How variable types can change at runtime.
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