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Control Statements in Actions
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   "Control statements" such as `if', `while', and so on control the
flow of execution in `awk' programs.  Most of the control statements in
`awk' are patterned on similar statements in C.

   All the control statements start with special keywords such as `if'
and `while', to distinguish them from simple expressions.

   Many control statements contain other statements; for example, the
`if' statement contains another statement which may or may not be
executed.  The contained statement is called the "body".  If you want
to include more than one statement in the body, group them into a
single compound statement with curly braces, separating them with
newlines or semicolons.

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If Statement
Conditionally execute some `awk' statements.
While Statement
Loop until some condition is satisfied.
Do Statement
Do specified action while looping until some condition is satisfied.
For Statement
Another looping statement, that provides initialization and increment clauses.
Break Statement
Immediately exit the innermost enclosing loop.
Continue Statement
Skip to the end of the innermost enclosing loop.
Next Statement
Stop processing the current input record.
Next File Statement
Stop processing the current file.
Exit Statement
Stop execution of `awk'.