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Awk is very popular text processing tool. Awk provides different functionalies and structures like programming languages. if - if else is very useful conditional statement used to create decision trees.

if - if else used to check given situation or operations and run accordingly. For example we can check the age of the person and act accordingly if over 60 or below 60 .

Example Data

During learning awk if- if else statements we will use following file.

Awk If Statement

Awk if statement syntax is like below. We will check condition and if the condition is met or true we will execute the code part. If not we simply skip if code block.

In this example we will look for the name ismail and then print his age.

We will save the awk script as if-program and call with awk -f parameter like below.

Or we can provide the script from bash like below.

Awk Else If Statement

What will happen if we have more than single condition to check and execute script. We can use else if statements for multi condition situations. Syntax of else if is like below.

We can use more than if else  according to our needs.

In this example we will list persons with two different condition like over 18 and below 18 .

When we run this code like below.

Awk Else Statement

While using if else conditional statements we may need to specify default condition where it will met if none of the other condition is met. We can it else and put to the end of the if-else if block. Syntax is like below

In this example we will check the gender and given record is not male we will print a message. In this example we do not add elseif because we do not need but they can be added without problem if needed.

We save this script as else-program and run like below.

https://www.poftut.com/awk-if-if-else-else-statement-or-conditional-statements/

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