(gawk.info) BEGIN/END

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 The `BEGIN' and `END' Special Patterns
 --------------------------------------
 
    `BEGIN' and `END' are special patterns.  They are not used to match
 input records.  Rather, they supply start-up or clean-up actions for
 your `awk' script.
 

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* Using BEGIN/END             How and why to use BEGIN/END rules.
* I/O And BEGIN/END           I/O issues in BEGIN/END rules.
 

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