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User-defined Functions
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   Complicated `awk' programs can often be simplified by defining your
own functions.  User-defined functions can be called just like built-in
ones (see Function Calls.), but it is up to you to define them--to
tell `awk' what they should do.

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Definition Syntax
How to write definitions and what they mean.
Function Example
An example function definition and what it does.
Function Caveats
Things to watch out for.
Return Statement
Specifying the value a function returns.