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As you have already seen, each awk statement consists of
a pattern with an associated action. This chapter 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.
awk.