BASH/C3/Basics-of-functions/English-timed - Revision history

Pratik kamble at 11:38, 23 March 2017

2017-03-23T11:38:09Z

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Pratik kamble at 10:10, 7 March 2017

2017-03-07T10:10:54Z

Pratik kamble at 10:07, 7 March 2017

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Sandhya.np14 at 04:40, 14 July 2015

2015-07-14T04:40:17Z

Sandhya.np14 at 18:43, 5 July 2015

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PoojaMoolya at 09:12, 8 December 2014

2014-12-08T09:12:50Z

Gaurav: Created page with "{|border = 1 | '''Visual Cue''' | '''Narration''' |- | 00.01 | Dear friends, Welcome to the spoken tutorial on '''Basics of functions in Bash.''' |- | 00.08 | In this tuto..."

2014-11-20T10:13:59Z

Created page with "{|border = 1 | '''Visual Cue''' | '''Narration''' |- | 00.01 | Dear friends, Welcome to the spoken tutorial on '''Basics of functions in Bash.''' |- | 00.08 | In this tuto..."

New page

{|border = 1
| '''Visual Cue'''
| '''Narration'''

|-
| 00.01
| Dear friends, Welcome to the spoken tutorial on '''Basics of functions in Bash.'''

|-
| 00.08
| In this tutorial, we will learn

|-
| 00.11
|* Importance of '''Functions'''
|-
| 00.13
|* To declare a''' function'''
|-
| 00.15
|* To call a''' function'''
|-
| 00.17
|* Work flow of a '''function'''
|-
| 00.19
|* with the help of an example

|-
| 00.22
| To follow this tutorial you should have knowledge of '''Shell Scripting''' in''' BASH.'''

|-
| 00.28
|If not, for relevant tutorials please visit our website which is as shown,'''http://www.spoken-tutorial.org'''

|-
| 00.34
| For this tutorial I am using''' Ubuntu Linux''' 12.04''' Operating System'''

|-
| 00.40
|Till now we were using '''GNU BASH '''version 4.1.10

|-
| 00.46
|From now onwards, we will use '''GNU BASH''' version 4.2

|-
| 00.52
|Please note,''' GNU Bash version 4''' or above is recommended for practice.

|-
| 00.58
| Let us see what is a''' function''' and its usage.

|-
| 01.03
| * A '''function''' is a collection of commands or an algorithm.

|-
| 01.08
|* It is intended to do a specific task.

|-
| 01.12
|* It is used to break up a complex program into separate tasks.

|-
| 01.18
|* This improves overall script readability and ease of use.

|-
| 01.24
| There are two syntaxes for '''function''' declaration.

|-
| 01.28
| First syntax is

|-
| 01.29
|'''function space function underscore name'''

|-
| 01.32
|within curly brackets,

|-
| 01.34
|the '''commands''' to be executed

|-
| 01.37
| The second syntax is

|-
| 01.39
|'''function underscore name open and close round brackets'''

|-
| 01.42
|within curly barckets,

|-
| 01.44
|the '''commands''' to be executed

|-
| 01.47
| '''Function call'''

|-
| 01.48
|'''Function''' can be called anywhere within the program.

|-
| 01.53
|Type the '''function name '''at the location where you want to call it.

|-
| 01.58
|The syntax is the''' function name '''itself.

|-
| 02.02
| Let us understand this with the help of a simple example.

|-
| 02.07
| I have already typed the code in a file '''function.sh'''

|-
| 02.12
| This is the''' shebang line'''.

|-
| 02.14
| '''Function''' is declared by the keyword '''function''' followed by '''function name'''.

|-
| 02.21
|Here, '''function name''' is '''machine'''.

|-
| 02.26
| The content within curly brackets is called '''function definition'''.

|-
| 02.32
|I have displayed various machine details like-

|-
| 02.36
|'''uname hyphen a '''gives machine information.

|-
| 02.41
|'''w hyphen h '''gives users logged onto system.

|-
| 02.46
|'''uptime '''gives the time since machine was on.

|-
| 02.51
|'''free''' gives memory status.

|-
| 02.54
|'''df hyphen h''' gives filesystem status.

|-
| 02.57
| The main program starts here.

|-
|03.01
|We display the message ''' “Beginning of main program” '''

|-
| 03.06
| Here,''' machine '''is a '''function call. '''

|-
| 03.09
| Then we display the message '''“End of main program”'''

|-
| 03.13
| Let us understand the workflow.

|-
| 03.16
|# When the '''bash interpreter''' visits the '''function definition''', it simply scans the '''function.'''

|-
| 03.23
|# The '''function''' is called only when its name appears within the script.

|-
| 03.28
|# When the '''interpreter''' reads the '''function name''', it executes the '''function definition.'''

|-
| 03.36
| The '''interperter''' treats '''function name '''as a command.
|-
| 03.41
|Please remember that we have to '''define''' the '''function''' before '''calling''' it.

|-
| 03.47
| Now go to the''' terminal.''' To make this code file'' ''executable

|-
| 03.52
|Type: '''chmod space plus x space function dot sh'''

|-
| 03.59
|Press '''Enter.'''

|-
| 04.01
| type '''dot slash function dot sh'''

|-
| 04.05
|Press '''Enter.'''

|-
| 04.07
| The output that is the machine details of my system, are seen on the '''terminal.'''

|-
| 04.14
|Please Note: The output will vary from system to system.

|-
| 04.19
|This brings us to the end of this tutorial.

|-
| 04.22
|Come back to our slides.

|-
| 04.24
| Let us summarize.

|-
| 04.25
|In this tutorial we learnt,

|-
| 04.28
|* Importance of '''functions'''
|-
| 04.30
|* '''Function declaration'''

|-
| 04.32
|* '''Function call'''

|-
| 04.33
|* Work flow of '''function'''

|-
| 04.35
|* with an example

|-
| 04.37
| As an assignment.

|-
| 04.38
|Write a program with two functions

|-
| 04.42
|# The first function should display the diskspace usage in human readable form '''(Hint: df hyphen h)'''

|-
| 04.51
|# The second function should display filesystem usage in human readable form '''(Hint: du hyphen h)'''

|-
| 05.00
| Watch the video available at the link shown below

|-
| 05.03
|It summarises the Spoken Tutorial project

|-
| 05.07
|If you do not have good bandwidth, you can download and watch it

|-
| 05.12
| The Spoken Tutorial Project Team Conducts workshops using spoken tutorials

|-
| 05.17
|Gives certificates to those who pass an online test

|-
| 05.21
|For more details, please write to contact@spoken-tutorial.org

|-
| 05.29
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 05.33
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 05.41
|More information on this Mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro

|-
| 05.47
| The script has been contributed by FOSSEE and spoken-tutorial team

|-
| 05.52
|This is Ashwini Patil from IIT Bombay. Signing off

|-
| 05.56
|Thank you for joining.

|}

@@ Line 77: / Line 77: @@
 |-
 | 01.28
-| First syntax is-
+| First syntax is-'''function space function_name'''
-−
-|-
-|  01.29
-|'''function space function_name'''
 |-
@@ Line 109: / Line 105: @@
 |-
 |  01.47
-| '''Function call'''-
+| '''Function call'''-'''Function''' can be called anywhere within the program.
-−
-|-
-|  01.48
-|'''Function''' can be called anywhere within the program.
 |-
@@ Line 260: / Line 252: @@
 |-
 |  04.32
-|* '''Function call'''
+|* '''Function call''' Work flow of '''function'''
-−
-|-
-|  04.33
-|* Work flow of '''function'''
 |-
@@ Line 272: / Line 260: @@
 |-
 | 04.37
-| As an assignment-
+| As an assignment-write a program with two functions.
-−
-|-
-|  04.38
-|write a program with two functions.
 |-

@@ Line 248: / Line 248: @@
 |-
 | 04.24
-| Let us summarize.
+| Let us summarize. In this tutorial, we learned:
-−
-|-
-|  04.25
-|In this tutorial, we learned:
 |-
 |  04.28
 |* Importance of '''functions'''
 |-
 |  04.30

@@ Line 49: / Line 49: @@
 |-
 |  00.52
-|Please note,''' GNU Bash version 4''' or above is recommended for practice.
+|Please note,''' GNU Bash''' version 4 or above is recommended for practice.
 |-
@@ Line 65: / Line 65: @@
 |-
 |  01.12
-| It is used to break up a complex program into separate tasks.
+| It is used to break-up a complex program into separate tasks.
 |-
@@ Line 81: / Line 81: @@
 |-
 |  01.29
-|'''function space function underscore name'''
+|'''function space function_name'''
 |-
@@ Line 97: / Line 97: @@
 |-
 |  01.39
-|'''function underscore name open and close round brackets'''
+|'''function_name open and close round brackets'''
 |-
 |  01.42
-|within curly barckets,
+|within curly brackets,
 |-
@@ Line 121: / Line 121: @@
 |-
 |  01.58
-|The syntax is the''' function name '''itself.
+|The syntax is the''' function_name '''itself.
 |-
@@ Line 141: / Line 141: @@
 |-
 |  02.21
-|Here, '''function name''' is '''machine'''.
+|Here, the '''function name''' is '''machine'''.
 |-
 | 02.26
-| The content within curly brackets is called '''function definition'''.
+| The contents within curly brackets is called '''function definition'''.
 |-
@@ Line 283: / Line 283: @@
 |-
 |  04.42
-|# The first function should display the disks-pace usage in human readable form '''(Hint: df hyphen h)'''.
+|# The first function should display the disk-space usage in human readable form (Hint: df hyphen h).
 |-
 |  04.51
-|# The second function should display filesystem usage in human readable form '''(Hint: du hyphen h)'''.
+|# The second function should display filesystem usage in human readable form (Hint: du hyphen h).
 |-
@@ Line 323: / Line 323: @@
 |-
 |  05.41
-|More information on this mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro
+|More information on this mission is available at the link shown below: http://spoken-tutorial.org/NMEICT-Intro
 |-

@@ Line 1: / Line 1: @@
 {|border = 1
-| '''Visual Cue'''
+| '''Time'''
 | '''Narration'''