(gawk.info)User-defined

User-defined Functions
**********************

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



* 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.