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Control Statements in Actions

   "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 that may or may not be executed.  The
contained statement is called the "body".  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.

If Statement
Conditionally execute some `awk'
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
Next Statement
Stop processing the current input record.
Nextfile Statement
Stop processing the current file.
Exit Statement
Stop execution of `awk'.

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