Patterns, Actions, and Variables
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As you have already seen, each `awk' statement consists of a pattern
with an associated action. This major node describes how you build
patterns and actions, what kinds of things you can do within actions,
and `awk''s built-in variables.
The pattern-action rules and the statements available for use within
actions form the core of `awk' programming. In a sense, everything
covered up to here has been the foundation that programs are built on
top of. Now it's time to start building something useful.