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.

• 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.
• Switch Statement		Switch/case evaluation for conditional execution of statements based on a value.
• 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.
• Nextfile Statement		Stop processing the current file.
• Exit Statement		Stop execution of `awk`.