BASH/C3/Advance-topics-in-a-function/English-timed - Revision history

Pratik kamble at 11:45, 23 March 2017

2017-03-23T11:45:38Z

Pratik kamble at 11:43, 23 March 2017

2017-03-23T11:43:48Z

Pratik kamble at 10:18, 7 March 2017

2017-03-07T10:18:26Z

Sandhya.np14 at 04:03, 15 July 2015

2015-07-15T04:03:13Z

Sandhya.np14 at 14:06, 6 July 2015

2015-07-06T14:06:16Z

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Pratik kamble: Created page with "{|border=1 |'''Time''' |'''Narration''' |- | 00:01 | Dear friends, Welcome to the spoken tutorial on'''Advance topics in a function ''' |- | 00:08 | In this tutorial, we wil..."

2014-11-19T11:58:26Z

Created page with "{|border=1 |'''Time''' |'''Narration''' |- | 00:01 | Dear friends, Welcome to the spoken tutorial on'''Advance topics in a function ''' |- | 00:08 | In this tutorial, we wil..."

New page

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

|-
| 00:01
| Dear friends, Welcome to the spoken tutorial on'''Advance topics in a function '''

|-
| 00:08
| In this tutorial, we will learn

|-
| 00:11
| '''Source '''command

|-
| 00:12
| To put a function in the '''background'''

|-
| 00:14
| With the help of some examples.

|-
| 00:18
| To follow this tutorial you should have knowledge of '''Shell Scripting''' in''' BASH.'''

|-
| 00:24
|If not, for relevant tutorials, please visit our website which is as shown '''http://spoken-tutorial.org/What\_is\_a\_Spoken\_Tutorial'''

|-
| 00:30
| For this tutorial I am using

|-
| 00:32
|* '''Ubuntu Linux''' 12.04 Operating System and

|-
| 00:36
|'''GNU BASH''' version 4.2

|-
| 00:40
|Please note,''' GNU Bash''' version 4 or above is recommended for practice.

|-
| 00:46
| '''Source '''command is used to load a file into '''Shell '''script.

|-
| 00:53
| It reads and execute commands from that file.

|-
| 00:58
| It also imports code into the script.

|-
| 01:01
| This is useful when multiple scripts use a common data or a function library.

|-
| 01:09
| The syntax for '''Source command''' is as follows.

|-
| 01:12
|'''source filename'''

|-
| 01:15
|'''source Path_to_file '''

|-
| 01:18
|'''souce filename arguments'''

|-
|01:22
| Let me open a file ''''function dot sh''''.

|-
|01:26
| This is the'''shebang line'''.

|-
|01:29
|'''Source detail dot sh''' will load the file '''detail dot sh '''into''' function dot sh '''

|-
|01:37
| Let me open''' detail dot sh''' file.

|-
|01:41
|I have a '''function''' '''machin'''.

|-
|01:44
|Now type inside the function,

|-
|01:47
|'''echo '"function machine''' is called in '''function dot sh file"'

|-
|01:52
|Click on '''Save'''.

|-
|01:54
| Now let us go back to '''function dot sh '''file.

|-
|01:59
|Here type '''echo''' '''“Beginning of program”'''

|-
|02:04
|Click on''' Save'''

|-
|02:06
|Then type '''machine''' '''echo''' '''“End of program”'''

|-
|02:12
| This will print the message '''“Beginning of program”'''

|-
|02:16
| '''machine''' is the '''function call.'''

|-
|02:19
| And this will print the message '''End of program'''

|-
|02:23
| Note that '''machine''' is the '''function''' which we created in the '''detail dot sh''' file.

|-
|02:29
|And we are calling the '''function''' here in '''function dot sh''' file.

|-
|02:34
| Now click on '''Save'''.

|-
| 02:36
| Let us execute the program.

|-
| 02:41
| So type on the '''terminal''' '''chmod space plus (+) x space function dot sh'''

|-
|02:51
| Press '''Enter'''

|-
|02:53
| Type '''dot slash function dot sh'''

|-
|02:56
| Press''' Enter.'''

|-
|02:59
| The output is displayed

|-
| 03:02
| Now let's move on to '''background function.'''

|-
|03:06
| To run a process in the background, we use '''&''' (ampersand)''' at the end of a '''function call.'''

|-
|03:13
| The '''shell''' forks a '''child process''' to run the command.

|-
|03:19
|The forked process will have a '''job number''' and a '''PID (Process IDentifier)'''

|-
| 03:27
| Let us understand this with the help of an example. I will open the file '''background dot sh'''

|-
|03:35
| This is the''' shebang line.'''

|-
|03:38
| '''bg underscore function''' marks the beginning of the '''function.'''

|-
|03:44
| The '''echo statement''' here displays the message '''"Inside bg_function”'''

|-
|03:50
| Next, we will use the '''find command '''to find all the dot'''mp3 '''files.

|-
|03:57
| This statement will find all the files with the extension '''dot mp3'''

|-
|04:03
| It will do so in the current working directory.

|-
|04:07
| '''Hyphen iname '''is used to ignore the case.

|-
|04:11
| And the result is stored in '''myplaylist.txt'''.

|-
|04:16
| Now type '''bg underscore function ampersand(&)''' This is the '''function call.''' '''&(Ampersand)''' puts ''''bg_function'''' in the background.

|-
|04:28
| Now click on '''Save'''.

|-
|04:31
| Let us execute the program.

|-
|04:34
| Come back to the '''terminal.'''

|-
|04:37
| Type '''chmod space plus x space background dot sh'''

|-
|04:45
| Press '''Enter.'''

|-
| 04:46
|Now type '''dot slash background dot sh'''

|-
| 04:51
|Press''' Enter.'''

|-
| 04:53
|Blank output indicates '''dot mp3''' file is not present in current directory.

|-
|05:02
| Now, come back to our program.

|-
| 05:05
|Type '''echo (hyphen) -e "'Process runing in background are slash n'" ''' and '''jobs space hyphen l'''

|-
| 05:19
|Click on''' Save'''

|-
|05:21
| This '''echo statement''' will displays the message “'''Process runing in background are ”'''

|-
|05:28
| '''Jobs space hyphen l '''lists the status of all '''background jobs'''.

|-
|05:34
| Now come back to our '''terminal'''.

|-
| 05:38
|Now type ''' dot slash background.sh'''

|-
|05:42
| Press''' Enter.'''

|-
|05:44
| The output is shown.

|-
|05:48
|Here, '''one''' within opening and closing square bracket is the '''job number.'''

|-
|05:53
|3962 is the '''PID'''.

|-
|05:57
|'''PID '''will vary accordingly.

|-
|06:01
|If the function takes time to execute, it will run in the background.

|-
|06:06
|And we will see the status as '''Running'''.

|-
|06:11
|If the function gets executed before the script, we will see the status as '''Done'''

|-
|06:20
|The output will vary from machine to machine.

|-
|06:23
|This brings us to the end of this tutorial.

|-
|06:28
|Let us Summarise.

|-
|06:29
|In this tutorial we learnt

|-
|06:32
| '''Source '''command

|-
|06:34
| To put a function in the '''background'''

|-
|06:36
| With the help of some examples

|-
| 06:39
| As an assignment:

|-
| 06:40
|Write a function '''add''' to add two numbers and call the function in another file.

|-
|06:47
| Watch the video available at the link shown below http://spoken-tutorial.org/What\_is\_a\_Spoken\_Tutorial

|-
| 06:51
|It summarises the Spoken Tutorial project.

|-
| 06:55
|If you do not have good bandwidth, you can download and watch it.

|-
| 07:00
| The Spoken Tutorial Project Team .Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test

|-
| 07:10
| For more details, please write to contact@spoken-tutorial.org

|-
|07:18
| Spoken Tutorial Project is a part of the Talk to a Teacher project.

|-
| 07:22
| It is supported by the National Mission on Education through ICT, MHRD, Government of India.

|-
| 07:30
| More information on this Mission is available at the link shown below http://spoken-tutorial.org\NMEICT-Intro

|-
| 07:36
| The script has been contributed by FOSSEE and Spoken-Tutorial teams.

|-
|07:42
|This is Ashwini from IIT Bombay. Thank you for joining.

|}

@@ Line 329: / Line 329: @@
 |-
 |06:32
-|* '''Source '''command
+|'''Source '''command
 |-
 |06:34
-|* To put a function in the '''background'''
+|To put a function in the '''background'''
 |-
@@ Line 357: / Line 357: @@
 |-
 | 07:00
-| The Spoken Tutorial Project team: Conducts workshops using spoken tutorials.
+| The Spoken Tutorial Project team: Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test.
 Gives certificates to those who pass an online test.
 |-

@@ Line 13: / Line 13: @@
 |-
 | 00:11
-|* '''source '''command
+|'''source '''command To put a function in the '''background'''
-−
-|-
-| 00:12
-|* To put a function in the '''background'''
 |-
@@ Line 249: / Line 245: @@
 |-
 |04:45
-| Press '''Enter.'''
+| Press '''Enter.'''Now, type: '''dot slash background dot sh'''
-−
-|-
-| 04:46
-|Now, type: '''dot slash background dot sh'''
 |-
@@ Line 333: / Line 325: @@
 |-
 |06:28
-|Let us summarize.
+|Let us summarize.In this tutorial, we learned:
-−
-|-
-|06:29
-|In this tutorial, we learned:
 |-
@@ Line 353: / Line 341: @@
 |-
 | 06:39
-| As an assignment:
+| As an assignment:Write a function '''add''' to add two numbers and call the function in another file.
-−
-|-
-| 06:40
-|Write a function '''add''' to add two numbers and call the function in another file.
 |-
@@ Line 373: / Line 357: @@
 |-
 | 07:00
-| The Spoken Tutorial Project team:
+| The Spoken Tutorial Project team: 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 395: / Line 378: @@
 |-
 | 07:36
-| The script has been contributed by FOSSEE and Spoken-Tutorial teams.
+|The script has been contributed by FOSSEE and Spoken-Tutorial teams.
 |-

@@ Line 33: / Line 33: @@
 |-
 | 00:32
-|* '''Ubuntu Linux''' 12.04 Operating System and
+|'''Ubuntu Linux''' 12.04 Operating System and
 |-
 | 00:36
-|* '''GNU BASH''' version 4.2
+|'''GNU BASH''' version 4.2
 |-

@@ Line 13: / Line 13: @@
 |-
 | 00:11
-|* '''Source '''command
+|* '''source '''command
 |-
@@ Line 29: / Line 29: @@
 |-
 | 00:24
-|If not, for relevant tutorials, please visit our website which is as shown. '''http://spoken-tutorial.org/What_is_a_Spoken_Tutorial'''
+|If not, for relevant tutorials, please visit our website which is as shown. http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
 |-
@@ Line 49: / Line 49: @@
 |-
 | 00:46
-| '''Source''' '''command''' is used to '''load''' a file into '''Shell script'''.
+| '''source''' '''command''' is used to '''load''' a file into '''Shell script'''.
 |-
@@ Line 65: / Line 65: @@
 |-
 | 01:09
-| The syntax for '''Source command''' is as follows-
+| The syntax for '''source''' command is as follows-
 |-
@@ Line 77: / Line 77: @@
 |-
 | 01:18
-|'''souce filename  arguments'''.
+|'''souce filename arguments'''.
 |-
@@ Line 89: / Line 89: @@
 |-
 |01:29
-|'''Source detail dot sh''' will load the file '''detail dot sh '''into '''function dot sh'''.
+|'''source detail dot sh''' will load the file '''detail dot sh '''into '''function dot sh'''.
 |-
@@ Line 145: / Line 145: @@
 |-
 |02:29
-|And we are calling the '''function''' here, in '''function dot sh''' file.
+|And we are calling the '''function''', here, in '''function dot sh''' file.
 |-
@@ Line 181: / Line 181: @@
 |-
 |03:06
-| To run a process in the background, we use '''&''' (ampersand) at the end of a '''function call.'''
+| To '''run''' a '''process''' in the background, we use '''&''' (ampersand) at the end of a '''function call.'''
 |-
 |03:13
-| The '''shell''' forks a '''child process''' to '''run''' the '''command'''.
+| The '''shell''' '''fork'''s a '''child process''' to '''run''' the '''command'''.
 |-
 |03:19
-|The forked process will have a '''job number''' and a '''PID (Process Identifier)'''.
+|The forked '''process''' will have a '''job number''' and a '''PID (Process Identifier)'''.
 |-
@@ Line 205: / Line 205: @@
 |-
 |03:44
-| The '''echo statement''' here displays the message '''"Inside bg_function”'''.
+| The '''echo''' statement here displays the message '''"Inside bg_function”'''.
 |-
@@ Line 269: / Line 269: @@
 |-
 | 05:05
-|Type: '''echo (hyphen) -e "Process running in background are  slash n" ''' and '''jobs space hyphen l'''
+|Type: '''echo (hyphen) -e "Process running in background are: backslash n" ''' and '''jobs space hyphen l'''
 |-
@@ Line 277: / Line 277: @@
 |-
 |05:21
-| This '''echo statement''' will display the message “'''Process running in background are ”'''.
+| This '''echo''' statement will display the message “'''Process running in background are ”'''.
 |-
 |05:28
-| '''Jobs space hyphen l '''lists the status of all '''background jobs'''.
+| '''jobs space hyphen l '''lists the status of all '''background jobs'''.
 |-
@@ Line 313: / Line 313: @@
 |-
 |06:01
-|If the '''function''' takes time to execute, it will run in the background.
+|If the '''function''' takes time to execute, it will run the process in the background
 |-
 |06:06
-|And we will see the status as '''Running'''.
+|and we will see the status as '''"Running"'''.
 |-
 |06:11
-|If the '''function''' gets executed before the script, we will see the status as '''Done'''.
+|If the '''function''' gets executed before the script, we will see the status as '''"Done"'''.
 |-
@@ Line 333: / Line 333: @@
 |-
 |06:28
-|Let us Summarize.
+|Let us summarize.
 |-
@@ Line 383: / Line 383: @@
 |-
 |07:18
-| '''Spoken Tutorial''' Project is a part of the '''Talk to a Teacher''' project.
+| '''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.
 |-
@@ Line 391: / Line 391: @@
 |-
 | 07:30
-| 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
 |-