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gawk: Statements

 7.4 Control Statements in Actions
 "Control statements", such as 'if', 'while', and so on, control the flow
 of execution in 'awk' programs.  Most of 'awk''s control statements are
 patterned after 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 braces, separating them with newlines or semicolons.


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