BASH/C2/Case-statement/English-timed - Revision history

PoojaMoolya at 06:17, 17 March 2017

2017-03-17T06:17:42Z

Sandhya.np14 at 12:50, 13 July 2015

2015-07-13T12:50:26Z

Sandhya.np14 at 18:19, 5 July 2015

2015-07-05T18:19:04Z

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PoojaMoolya at 07:20, 8 December 2014

2014-12-08T07:20:18Z

Pratik kamble at 10:30, 20 November 2014

2014-11-20T10:30:31Z

Pratik kamble: Created page with " {| border=1 |'''Time''' | '''Narration''' |- | 00:01 | Dear friends, Welcome to the spoken tutorial on '''Case statement in Bash.''' |- | 00:07 | In this tutorial, we will..."

2014-11-20T10:29:48Z

Created page with " {| border=1 |'''Time''' | '''Narration''' |- | 00:01 | Dear friends, Welcome to the spoken tutorial on '''Case statement in Bash.''' |- | 00:07 | In this tutorial, we will..."

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{| border=1
|'''Time'''
| '''Narration'''

|-
| 00:01
| Dear friends, Welcome to the spoken tutorial on '''Case statement in Bash.'''

|-
| 00:07
| In this tutorial, we will learn Importance of '''case statement''' Syntax of '''case statement''' with an Example

|-
| 00:17
| To follow this tutorial, you should have knowledge on Basics of '''Shell Scripting'''.

|-
|00:23
|If not, for relevant tutorials please visit our website which is as shown.

|-
| 00:29
| For this tutorial I am using ''' Ubuntu Linux''' 12.04''' Operating System''' and '''GNU BASH''' version 4.1.10

|-
| 00:39
| Please note,''' GNU Bash''' version 4 or above is recommended to practice this tutorial.

|-
| 00:47
| The '''Bash '''shell has two forms of conditional statements. These are the '''if statement''' and the '''case statement. '''

|-
| 00:56
|'''Case statement '''can be alternately used in place of '''if-else statement'''

|-
|01:03
|The '''case statement''' is preferred when there are many items to select from.

|-
|01:09
|It is usually used to implement '''menus''' in a script.

|-
| 01:14
|Let us see the syntax.

|-
|01:15
|'''case space $(dollar)VARIABLE space in''' '''match_1''' close round brackets space '''commands''' and semicolon twice

|-
|01:27
|'''match_n''' close round bracket space '''commands''' and semicolon twice '''asterisk''' close round bracket space command_to_execute_by_default''' and semicolon twice '''esac'''

|-
| 01:45
| The '''VARIABLE '''is compared to '''match_1.'''

|-
|01:48
|If it does not match, it moves on to the next case which is '''match_n.'''

|-
|01:54
|It will check if any one of these strings matches '''VARIABLE. '''

|-
|02:01
|If yes, then all the commands until the double''' semicolon (;;) '''are executed.

|-
| 02:07
| If neither match''' VARIABLE''', the commands associated with the '''asterisk '''are executed.

|-
| 02:14
|It is the default '''case '''condition because the '''asterisk '''will match all strings.

|-
| 02:21
|'''esac''' marks the end of '''case block.'''

|-
| 02:26
| Let us understand '''case statement''' with an example.

|-
| 02:32
| I have already typed the program.So, I will open the file''' case.sh'''

|-
|02:38
|The program prints a warning message when the disk space reaches a certain limit.

|-
| 02:45
| This is the''' shebang line.'''

|-
|02:47
|The location of '''bash '''is different in other '''Linux''' flavours like '''CentOS, RedHat etc.'''

|-
|02:55
|Previously used '''/bin/bash '''points directly to the''' binary file'''.

|-
|03:01
|'''env''' used here, abstracts the true location where '''bash''' is located.

|-
|03:07
|This '''shebang '''line improves the portability of the script on any '''GNU/Linux''' system.

|-
| 03:16
| '''df -(hyphen)h displays disk space''' usage in human readable form.

|-
|03:22
|The output is piped to '''sort -rk5''', which sorts the fifth column in reverse order.

|-
|03:31
|The output is then passed to '''awk 'FNR == 2 {print $5}''''

|-
|03:38
|which extracts the fifth field of the second line.

|-
|03:43
|Eventually, the output is passed to '''cut -(hyphen)d “% -(hyphen)f1” '''to strip out '''% sign.'''

|-
| 03:55
| This is the first line of '''case statement.'''

|-
| 03:59
|Here, we compare the '''space''' between 0 and 69.

|-
|04:04
|If match is found, it prints “'''Everything is OK”'''

|-
| 04:08
| Next, it compares the '''space''' between 70 and 89 or from 91 to 98;

|-
|04:17
|If match is found, it prints '''“Clean out. There's a partition that is $(dollar)space % full.”'''

|-
| 04:27
| Here, it compares the '''space''' with 99.

|-
|04:30
|If match is found, it prints '''“Hurry. There's a partition at $(Dollar) space %!”'''

|-
|04:39
| This is the default case condition because the '''asterisk '''will match all strings.

|-
| 04:45
| And this is the end of '''case statement.'''

|-
| 04:48
| Now go to the''' terminal,'''to make the file'' ''executable.

|-
|04:52
|Type''' chmod space plus x space case dot sh '''

|-
|04:57
|Type '''dot slash case dot sh'''

|-
| 05:02
| '''Everything is OK.'''Note that the output will vary depending on your system diskspace.

|-
| 05:10
| In my machine, as match is found between 0 and 69, it prints '''Everything is OK.'''

|-
|05:18
|Check the message printed on your machine.

|-
|05:20
|You will be able to understand which '''case statement''' was executed.

|-
| 05:27
|This brings us to the end of this tutorial. Let us summarize.

|-
|05:31
|In this tutorial we learnt, Importance of''' case statement''' Syntax of '''case statement''' With the disc space example

|-
| 05:41
| As an assignment.

|-
|05:42
|Write a menu driven program for mathematical calculation

|-
|05:47
| It should take user inputs '''a '''and '''b'''

|-
|05:51
| It should ask for mathematical opertator(plus +, minus -, division / and multiplication *)Do the calculation Print the output

|-
| 06:01
| Watch the video available at the link shown below

|-
|06:06
|It summarises the Spoken Tutorial project

|-
|06:08
|If you do not have good bandwidth, you can download and watch it

|-
| 06:14
| The Spoken Tutorial Project Team

|-
| 06:16
|Conducts workshops using spoken tutorials .Gives certificates to those who pass an online test

|-
| 06:23
|For more details, please write to contact@spoken-tutorial.org

|-
|06:31
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 06:35
|It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro

|-
| 06:48
| The script has been contributed by FOSSEE and spoken-tutorial team

|-
| 06:53
|This is Ashwini from IIT Bombay.Thank you for joining.

|}

@@ Line 10: / Line 10: @@
 |-
 | 00:07
-| In this tutorial, we will learn:
+| In this tutorial, we will learn: Importance of '''case statement''', Syntax of '''case statement''' with an example.
-* Importance of '''case statement'''
-* Syntax of '''case statement''' with an example.
 |-
@@ Line 24: / Line 22: @@
 |-
 | 00:29
-| For this tutorial, I am using:
+| For this tutorial, I am using: ''' Ubuntu Linux''' 12.04''' Operating System''' and  '''GNU BASH''' version 4.1.10
-* ''' Ubuntu Linux''' 12.04''' Operating System''' and
-* '''GNU BASH''' version 4.1.10
 |-
@@ Line 50: / Line 46: @@
 |-
 | 01:14
-|Let us see the syntax.
+|Let us see the syntax. '''case space $(dollar) VARIABLE space in match_1 close round-bracket space commands''' and semicolon twice
-−
-|-
-|01:15
-|'''case space $(dollar) VARIABLE space in match_1 close round-bracket space commands''' and semicolon twice
 |-
@@ Line 210: / Line 202: @@
 |-
 |05:31
-|In this tutorial, we learned:
+|In this tutorial, we learned: Importance of''' case''' statement, Syntax of '''case''' statement with the '''disc-space''' example.
-* Importance of''' case''' statement
-* Syntax of '''case''' statement with the '''disc-space''' example.
 |-
 | 05:41
-| As an assignment:
+| As an assignment: Write a menu driven program for mathematical calculation-
-−
-|-
-|05:42
-|Write a menu driven program for mathematical calculation-
 |-
 |05:47
-|* It should take user inputs 'a' and  'b';
+| It should take user inputs 'a' and  'b';
 |-
 |05:51
-|* It should ask for mathematical operator (plus +, minus -, division / and multiplication *). * Do the calculation * print the output.
+|It should ask for mathematical operator (plus +, minus -, division / and multiplication *). * Do the calculation * print the output.
 |-
@@ Line 248: / Line 234: @@
 |-
 | 06:16
-|Conducts workshops using spoken tutorials ;
+|Conducts workshops using spoken tutorials ; Gives certificates to those who pass an online test.
 Gives certificates to those who pass an online test.
 |-

@@ Line 16: / Line 16: @@
 |-
 | 00:17
-| To follow this tutorial, you should have knowledge on basics of '''Shell Scripting'''.
+| To follow this tutorial, you should have knowledge on basics of '''Shell''' scripting.
 |-
@@ Line 34: / Line 34: @@
 |-
 | 00:47
-|  The '''Bash''' '''shell''' has two forms of '''conditional statements'''. '''if statement''' and  '''case statement.'''
+|  The '''Bash''' '''shell''' has two forms of '''conditional statements'''-''' 'if' statement''' and''' 'case' statement.'''
 |-
 | 00:56
-|'''Case statement '''can be alternately used in place of '''if-else statement'''.
+|'''Case''' statement can be alternately used in place of '''if-else''' statement.
 |-
 |01:03
-|The '''case statement''' is preferred when there are many items to select from.
+|The '''case''' statement is preferred when there are many items to select from.
 |-
 |01:09
-|It is usually used to implement '''menus''' in a script.
+|It is usually used to implement '''menu'''s in a script.
 |-
@@ Line 54: / Line 54: @@
 |-
 |01:15
-|'''case''' space '''$(dollar) VARIABLE''' space '''in''' '''match_1''' close round brackets space '''commands''' and semicolon twice
+|'''case space $(dollar) VARIABLE space in match_1 close round-bracket space commands''' and semicolon twice
 |-
 |01:27
-|'''match_n''' close round bracket space '''commands''' and semicolon twice '''asterisk''' close round bracket space '''command_to_execute_by_default''' and semicolon twice '''esac'''.
+|'''match_n close round-bracket space commands''' and semicolon twice asterisk close round=bracket space '''command_to_execute_by_default''' and semicolon twice '''esac'''.
 |-
@@ Line 70: / Line 70: @@
 |-
 |01:54
-|It will check if any one of these '''strings''' matches '''VARIABLE. '''
+|It will check if any one of these '''strings''' matches '''VARIABLE.'''
 |-
 |02:01
-|If yes, then all the '''commands''' until the double''' semicolon (;;) '''are executed.
+|If 'yes' then all the '''commands''' until the double semicolon (;;) are executed.
 |-
@@ Line 106: / Line 106: @@
 |-
 |02:47
-|The location of '''bash '''is different in other '''Linux''' flavors like '''CentOS, RedHat etc.'''
+|The location of '''bash '''is different in other '''Linux''' flavors like '''CentOS, RedHat''' etc.
 |-
@@ Line 118: / Line 118: @@
 |-
 |03:07
-|This '''shebang '''line improves the portability of the script on any '''GNU/Linux''' system.
+|This '''shebang line''' improves the portability of the script on any '''GNU/Linux''' system.
 |-
 | 03:16
-| '''df -(hyphen)h displays disk space''' usage in human readable form.
+| '''df -(hyphen)h''' displays '''disk space''' usage in human readable form.
 |-
@@ Line 130: / Line 130: @@
 |-
 |03:31
-|The output is then passed to '''awk 'FNR == 2 {print $5}''''
+|The output is then passed to '''awk 'FNR == 2 {print $5}' '''
 |-
 |03:38
-|which extracts the fifth field of the second line.
+|which extracts the fifth '''field''' of the second line.
 |-
 |03:43
-|Eventually, the output is passed to '''cut -(hyphen)d “% -(hyphen)f1” '''to strip out '''% sign.'''
+|Eventually, the output is passed to '''cut -(hyphen)d “% -(hyphen)f1” '''to strip out '''%''' sign.
 |-
@@ Line 154: / Line 154: @@
 |-
 | 04:08
-| Next, it compares the '''space''' between 70 and 89 or from 91 to 98;
+| Next, it compares the '''space''' between 70 and 89 or from 91 to 98.
 |-
@@ Line 170: / Line 170: @@
 |-
 |04:39
-| This is the default case condition because the '''asterisk '''will match all strings.
+| This is the default '''case''' condition because the asterisk will match all '''strings'''.
 |-
@@ Line 178: / Line 178: @@
 |-
 | 04:48
-| Now go to the''' terminal''' to make the file executable.
+| Now, go to the''' terminal''' to make the file executable.
 |-
@@ Line 190: / Line 190: @@
 |-
 | 05:02
-| '''Everything is OK.''' Note that the output will vary depending on your system disk space.
+| ''' "Everything is OK".''' Note that the output will vary depending on your system disk space.
 |-
 | 05:10
-| In my machine, as match is found between 0 and 69, it prints '''Everything is OK.'''
+| In my machine, as match is found between 0 and 69, it prints '''"Everything is OK".'''
 |-
@@ Line 202: / Line 202: @@
 |-
 |05:20
-|You will be able to understand which '''case statement''' was executed.
+|You will be able to understand which '''case''' statement was executed.
 |-
 | 05:27
-|This brings us to the end of this tutorial.  Let us summarize.
+|This brings us to the end of this tutorial. Let us summarize.
 |-
 |05:31
-|In this tutorial, we learnt:
+|In this tutorial, we learned:
-* Importance of''' case statement'''
+* Importance of''' case''' statement
-* Syntax of '''case statement''' with the disc-space example.
+* Syntax of '''case''' statement with the '''disc-space''' example.
 |-
@@ Line 220: / Line 220: @@
 |-
 |05:42
-|Write a menu driven program for mathematical calculation;
+|Write a menu driven program for mathematical calculation-
 |-
 |05:47
-| It should take user inputs '''a '''and '''b''';
+|* It should take user inputs 'a' and  'b';
 |-
 |05:51
-| It should ask for mathematical operator (plus +, minus -, division / and multiplication *). Do the calculation,  print the output.
+|* It should ask for mathematical operator (plus +, minus -, division / and multiplication *). * Do the calculation * print the output.
 |-
@@ Line 261: / Line 261: @@
 |-
 | 06:35
-|It is supported by the National Mission on Education through ICT, MHRD, Government of India. More information on this mission is available at: http://spoken-tutorial.org\NMEICT-Intro
+|It is supported by the National Mission on Education through ICT, MHRD, Government of India. More information on this mission is available at: http://spoken-tutorial.org/NMEICT-Intro
 |-

@@ Line 30: / Line 30: @@
 |-
 | 00:47
-|  The '''Bash '''shell has two forms of conditional statements.  These are the '''if statement''' and the '''case statement. '''
+|  The '''Bash '''shell has two forms of conditional statements. '''if statement''' and  '''case statement. '''
 |-
@@ Line 90: / Line 90: @@
 |-
 | 02:32
-| I have already typed the program.So, I will open the file''' case.sh'''
+| I have already typed the program.So, I will open the file '''case.sh'''
 |-
@@ Line 106: / Line 106: @@
 |-
 |02:55
-|Previously used '''/bin/bash '''points directly to the''' binary file'''.
+|Previously used '''/bin/bash''' points directly to the''' binary file'''.
 |-
@@ Line 146: / Line 146: @@
 |-
 |04:04
-|If match is found, it prints “'''Everything is OK”'''
+|If match is found, it prints '''"Everything is OK”'''
 |-
@@ Line 174: / Line 174: @@
 |-
 | 04:48
-| Now go to the''' terminal,'''to make the file'' ''executable.
+| Now go to the''' terminal,''' to make the file executable.
 |-
@@ Line 206: / Line 206: @@
 |-
 |05:31
-|In this tutorial we learnt, Importance of''' case statement''' Syntax of '''case statement''' With the disc space example
+|In this tutorial we learnt, Importance of''' case statement''', Syntax of '''case statement''',  With the disc space example
 |-
@@ Line 222: / Line 222: @@
 |-
 |05:51
-| It should ask for mathematical opertator(plus +, minus -, division / and multiplication *)Do the calculation Print the output
+| It should ask for mathematical opertator (plus +, minus -, division / and multiplication *). Do the calculation,  Print the output
 |-
-| 06:01
+| 06:02
 | Watch the video available at the link shown below