PoojaMoolya at 06:01, 15 July 2019

2019-07-15T06:01:00Z

Sandhya.np14 at 04:32, 15 July 2019

2019-07-15T04:32:55Z

Sandhya.np14 at 04:29, 15 July 2019

2019-07-15T04:29:56Z

Sandhya.np14 at 06:25, 10 July 2019

2019-07-10T06:25:10Z

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PoojaMoolya at 07:09, 20 June 2019

2019-06-20T07:09:57Z

PoojaMoolya: Created page with "{| border=1 | '''Time''' | '''Narration''' |- | 00:01 | Hello and Welcome to this spoken tutorial on '''conditional statements''' in '''awk'..."

2018-12-14T06:20:10Z

Created page with "{| border=1 | <center>'''Time'''</center> | <center>'''Narration'''</center> |- | 00:01 | Hello and Welcome to this spoken tutorial on '''conditional statements''' in '''awk'..."

New page

{| border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

|-
| 00:01
| Hello and Welcome to this spoken tutorial on '''conditional statements''' in '''awk'''.

|-
| 00:07
| In this tutorial we will learn about- '''if''', '''else''', '''else if '''in''' awk'''

|-
| 00:15
| We will do this through some examples.

|-
| 00:19
| To record this tutorial, I am using '''Ubuntu Linux 16.04 Operating System '''and '''gedit text editor 3.20.1'''

|-
| 00:32
| You can use any text editor of your choice.

|-
| 00:36
| To practice this tutorial, you should have gone through the previous '''awk''' tutorials on our website.

|-
| 00:43
| You should have familiarity with any '''programming language''' like C or C++

|-
| 00:50
| If not, then please go through the corresponding tutorials on our website.

|-
| 00:56
| The files used in this tutorial are available in the '''Code Files''' link on this tutorial page.

Please download and extract them.

|-
| 01:06
| A '''conditional statement '''allows us to check a specified '''condition''' before performing an action.

|-
| 01:14
| Let’s learn how '''conditional statements '''like '''if, else, else-if''' work in '''awk'''.

|-
| 01:22
| Like any programming language, the syntax of '''if -else statement '''is:

|-
| 01:28
| '''if conditional-expression1''' is '''true '''then perform''' action1.'''

|-
| 01:34
| '''else if conditional-expression2''' is '''true''' then perform '''action 2.'''

|-
| 01:41
| A number of '''else if statements '''may follow after this.

|-
| 01:46
| At the end, if none of the specified '''conditional expressions '''are '''true''', then perform '''action n.'''

|-
| 01:54
| The '''else '''and '''else-if '''portions are optional.

Let us go through an example.

|-
| 02:02
| We will use the same '''awkdemo.txt '''file, that we have used earlier.

|-
| 02:10
| Say, we need to give 50% increment''' '''in stipend to the students getting more than 8000 rupees.

|-
| 02:19
| Let us create an '''awk''' file for this '''condition'''.

|-
| 02:23
| Type the following code as shown in a text editor and save it as '''cond''' '''dot''' '''awk'''

I have already done this.

|-
| 02:34
| The same file is also available in the '''Code Files''' link.

|-
| 02:39
| In this code, we have set the '''Output Field Separator''' as '''colon.'''

|-
| 02:45
| The first '''print statement '''prints the '''field headings.'''

|-
| 02:50
| Next, the '''if statement''' will check whether the value of the 6th '''field''' is greater than 8000.

|-
| 02:58
| If yes, the second '''print statement '''will get executed.

|-
| 03:03
| '''$6 into 1.5''' inside this '''print statement''' will multiply the 6th '''field''' value by 1.5%

|-
| 03:13
| Let’s execute this code now.

|-
| 03:16
| Open the '''terminal''' by pressing '''CTRL, ALT''' and '''T''' keys.

|-
| 03:22
| Go to the folder in which you downloaded and extracted the '''Code Files''' using '''cd command'''

|-
|03:29
| Now type: '''awk space hyphen capital F pipe symbol within double quotes space hyphen small f space cond dot awk space awkdemo dot txt'''

Press '''Enter.'''

|-
| 03:49
| The output shows only one student’s record with the incremented stipend who fulfilled the '''condition'''.

|-
| 03:57
| Now, suppose the rule changes: 50% increment in stipend for students who get more than 8000 rupees.

|-
| 04:07
| Otherwise give 30% increment.

How can we do that?

|-
| 04:13
| We need to add an '''else block.'''

|-
| 04:16
| Switch to the '''cond dot awk''' file once again.

|-
|04:21
| Let us add the following line of code.

Before the last closing '''curly brace''' press '''Enter.'''

|-
| 04:30
| '''else '''press '''Enter.'''

|-
| 04:33
| '''print space dollar 2 comma dollar 6 comma dollar 6 into 1.3'''

|-
| 04:42
| Save the file and switch to the '''terminal.'''

|-
| 04:46
| Press up key to get the previously executed command

and press '''Enter.'''

|-
| 04:53
| Observe the output now.

Yojna Chaudhury was previously getting 1000. Now she is getting 1300.

|-
| 05:04
| Let’s change the rules again.

50% increment for student getting more than 8000 rupees

|-
| 05:13
| 40% increment for student getting more than 4000 rupees

Otherwise give 30% increment

|-
| 05:23
| Switch to the code. Update the code as shown.

|-
| 05:29
| Save the file and switch to the '''terminal.'''

|-
| 05:33
| Let me clear the '''terminal'''.

|-
| 05:36
| Now press up key to get the previously executed command

and press '''Enter.'''

|-
| 05:44
| This time, notice that the student Mira Nair has got 40% increment.

|-
| 05:51
| This brings us to the end of this tutorial.

|-
| 05:54
| Let us summarize. In this tutorial we learnt about '''Conditional statements '''like:

'''if''' , '''else''', '''else if '''in''' awk'''

|-
| 06:05
| As an assignment give grades according to the rules: If mark is greater than equal to 90, grade will be A.

|-
| 06:15
| If mark is greater than equal to 80 but less than 90, grade will be B.

|-
| 06:23
| If mark is greater than equal to 70 but less than 80, grade will be C.

|-
| 06:30
| If mark is greater than equal to 60 but less than 70, grade will be D.

Otherwise grade will be F.

|-
|06:41
| The video at the following link summarises the Spoken Tutorial project.

Please download and watch it.

|-
| 06:49
| The Spoken Tutorial Project team conducts workshops using spoken tutorials

and gives certificates on passing online tests.

|-
| 06:58
| For more details, please write to us.

|-
| 07:02
| Do you have questions in THIS Spoken Tutorial?

Please visit this site

|-
| 07:08
| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

|-
| 07:20
| The script has been contributed by Antara. And this is Praveen from IIT Bombay signing off.

Thanks for joining.

|}

@@ Line 116: / Line 116: @@
 |-
 | 03:03
-| '''$6 into 1.5''' inside this '''print statement''' will multiply the 6th '''field''' value by 1.5% .
+| '''$6 into 1.5''' inside this '''print statement''' will multiply the 6th '''field''' value by 1.5 .
 |-

@@ Line 231: / Line 231: @@
 | 06:05
 | As an assignment, give grades according to the rules:
-If mark is greater than equal to 90, grade will be A.
+If '''mark''' is greater than equal to 90, grade will be A.
 |-

@@ Line 231: / Line 231: @@
 | 06:05
 | As an assignment, give grades according to the rules:
-If '''mark''' is greater than equal to 90, grade will be A.
+If '''mark''' is greater than equal to '''90''', grade will be '''A'''.
 |-
 | 06:15
-|  If mark is greater than equal to 80 but less than 90, grade will be B.
+|  If '''mark''' is greater than equal to '''80''' but less than '''90''', grade will be '''B'''.
 |-
 | 06:23
-|  If mark is greater than equal to 70 but less than 80, grade will be C.
+|  If '''mark''' is greater than equal to '''70''' but less than '''80''', grade will be '''C'''.
 |-
 | 06:30
-|  If mark is greater than equal to 60 but less than 70, grade will be D.
+|  If '''mark''' is greater than equal to '''60''' but less than '''70''', grade will be '''D'''.
-Otherwise, grade will be F.
+Otherwise, grade will be '''F'''.
 |-