Difference between revisions of "Linux-AWK/C2/Conditional-statements-in-awk/English"

• if
• else
• else if in awk

We will do this through some examples.

• Ubuntu Linux 16.04 OS and
• gedit text editor 3.20.1

You can use any text editor of your choice.

• To practice this tutorial, you should have gone through the previous awk tutorials on our website.
• You should have familiarity with any programming language like C or C++
• If not, then please go through the corresponding tutorials on our website.

Please download and extract them.

Let’s learn how conditional statements like if, else, else-if work in awk.

if conditional-expression1 is true then perform action1.

else if conditional-expression2 is true then perform action 2.

A number of else if statements may follow after this.

At the end, if none of the specified conditional expressions are true, then perform action n.

The else and else-if portions are optional.

Let us go through an example.

Let us create an awk file for this condition.

I have already done this.

The same file is also available in the Code Files link.

awk -F"|" -f cond.awk awkdemo.txt

[Enter]

awk space hyphen capital F pipe symbol within double quotes space hyphen small f space cond dot awk space awkdemo dot txt

Press Enter.

• 50% increment in stipend for students who get more than 8000 rupees.

• Otherwise give 30% increment.

How can we do that?

We need to add an else block.

[Enter]

Before the last closing curly brace press Enter.

print dollar 2 comma dollar 6 comma dollar 6 astrix 1.3

[Enter]

and press Enter.

Highlight

Yojna chaudhury:1000:1300

Yojna Chaudhury was previously getting 1000.

Now she is getting 1300.

• 50% increment for student getting more than 8000 rupees

• 40% increment for student getting more than 4000 rupees

• Otherwise give 30% increment

Type the highlighted portion

BEGIN{OFS=":";print "Name:Old stipend:New Stipend"} {if($6>8000)

print $2, $6,$6*1.5 [Enter]

else if($6>4000)

print $2,$6,$6*1.4

else

print $2,$6,$6*1.3}

Update the code as shown.

[Enter]

and press Enter.

Let us summarize.

In this tutorial we learnt about Conditional statements like:

• if
• else
• else if in awk

• If mark is greater than equal to 90, grade will be A.
• If mark is greater than equal to 80 but less than 90, grade will be B.
• If mark is greater than equal to 70 but less than 80, grade will be C.
• If mark is greater than equal to 60 but less than 70, grade will be D.
• Otherwise grade will be F.

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