gawk: BEGIN/END

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1 7.1.4 The 'BEGIN' and 'END' Special Patterns
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1 All the patterns described so far are for matching input records.  The
1 'BEGIN' and 'END' special patterns are different.  They supply startup
1 and cleanup actions for 'awk' programs.  'BEGIN' and 'END' rules must
1 have actions; there is no default action for these rules because there
1 is no current record when they run.  'BEGIN' and 'END' rules are often
1 referred to as "'BEGIN' and 'END' blocks" by longtime 'awk' programmers.
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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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