Meboreen Mary at 11:32, 30 April 2017

2017-04-30T11:32:09Z

Meboreen Mary: Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 |Dear friends, welcome to the '''Spoken tutorial''' on '''Introduction to BASH shell scripting'''. |- |00:08 |In this t..."

2017-04-30T11:31:06Z

Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 |Dear friends, welcome to the '''Spoken tutorial''' on '''Introduction to BASH shell scripting'''. |- |00:08 |In this t..."

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

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| 00:01
|Dear friends, welcome to the '''Spoken tutorial''' on '''Introduction to BASH shell scripting'''.

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

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| 00:10
|About different types of '''Shells'''

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| 00:13
|To write a '''Bash Shell script''' and

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| 00:16
|To execute it.

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|00:18
| To follow this tutorial, you should be familiar with '''Linux Operating System'''.

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|00:25
|If not, then for relevant '''Linux''' tutorials, please visit our website which is as shown.

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| 00:32
| For this tutorial, I am using:

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| 00:35
| '''Ubuntu Linux 12.04''' OS and

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| 00:39
|'''GNU Bash''' version '''4.1.10'''.

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| 00:43
| Please note, '''GNU Bash''' version '''4''' or above is recommended for practice.

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|00:50
| Let us start with an introduction.

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|00:53
|We will see what a '''Bash Shell '''is.

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| 00:56
| '''Bash Shell''' is a '''command language interpreter''' that '''executes''' '''commands'''.

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| 01:02
| These '''commands''' are read from the '''standard input''' device.

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| 01:07
| The input device can be-

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|01:09
| your '''keyboard'''

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|01:11
| or a simple''' text file'''.

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| 01:14
| Let me show you what is a '''Bash Shell'''.

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| 01:16
| Open the '''terminal''' '''window''' by pressing '''Ctrl+Alt+T''' keys simultaneously on your keyboard .

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|01:24
|This will open the '''Gnome terminal'''.

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|01:27
|To check which '''type''' of '''shell''' we are using, type: '''echo space dollar sign SHELL''' (in capital).

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|01:38
|Press '''Enter'''.

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|01:40
| You will see the '''output''' printed on the next line as: '''slash bin slash bash'''.

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|01:47
|This indicates that we are using the '''Bash Shell'''.

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|01:51
| Now, let us know different types of '''Shells '''available.

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|01:56
|Let us switch back to our '''slides'''. Bourne Shell-

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|02:00
|This was original UNIX '''shell''' written by Stephen Bourne.

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|02:06
| It lacked interactivity provided by most modern shells today.

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| 02:11
| '''C Shell'''-It provides features lacking in '''Bourne Shell '''.

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| 02:16
| '''K Shell'''- It was created by David Korn.

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| 02:20
|It has features of both, '''B Shell''' and '''C Shell''' along with some additional features.

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| 02:27
| '''Bash Shell'''-

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| 02:30
| The '''Bash Shell '''was developed by '''GNU Project'''.

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| 02:32
| It is based on '''B Shell''' language.

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|02:35
| It has features of''' C''' and '''K Shells.'''

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| 02:40
| '''TC Shell'''-It is the default '''Shell '''of '''FreeBSD '''and its descendants.

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| 02:46
| '''Z shell'''-

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|02:49
| It is a '''Shell''' designed for interactive use.

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| 02:52
|It has many useful features of '''ksh, bash''' and '''tcsh.'''

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| 02:58
|Now let us see what a '''Bash Shell script''' is.

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| 03:02
|The '''Bash Shell script ''' contains a series of '''Bash''' '''commands''' in plain '''text file'''.

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| 03:08
| It tells the '''Shell''' to '''execute''' this''' text file''' instead of typing the '''commands'''.

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| 03:15
| Let us see how to write a simple '''Bash script.'''

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| 03:20
| We will test the '''echo''' command''' which will print '''Hello World '''on the '''terminal'''.

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| 03:25
|Go back to the '''terminal'''.

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| 03:29
|Now, type: '''echo''' space within double quotes '''Hello world'''

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|03:35
|and press '''Enter'''.

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|03:37
| This prints '''Hello World''' on the '''terminal.'''

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| 03:40
| The '''command''' worked as expected.

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| 03:43
| Now, what if we want to use this '''command''' in a file?

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| 03:47
| Just put this '''command''' in a file and '''execute''' that file.

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| 03:52
| I will use '''gedit''' '''text-editor''' for this purpose.

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| 03:57
| You are free to use your favorite '''text-editor'''.

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|04:00
| I want to create my file on the '''Desktop'''.

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| 04:03
| So, type: '''cd''' space '''Desktop'''

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| 04:07
| Press '''Enter.'''

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| 04:09
|Now, type: '''gedit space hello underscore world dot sh space &'''(ampersand sign).

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|04:20
|'''gedit''' is the '''text editor'''. 'Hello underscore world dot sh' is the file name and

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|04:27
|we use the & (ampersand) to free up the '''prompt'''.

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| 04:32
| Now press '''Enter.'''We have opened a new file named '''hello_world.sh''' using '''gedit.'''

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| 04:40
| Now, type: '''hash exclamation mark front slash bin front slash bash'''

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| 04:47
| This is the first line of every '''bash script'''.

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| 04:51
| It is called as '''shebang''' or '''bang''' line.

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|04:55
|Press '''Enter'''.

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| 04:57
|Now, let's add a '''comment''' to the file by typing:

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|05:00
|'''hash space My first Bash script'''

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| 05:06
| Remember that any line after '''hash''' is treated as a '''comment.'''

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|05:11
|And '''comments''' are ignored by the '''Bash''' '''interpreter'''.

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| 05:15
| Now we can add the '''command''' which we used earlier.

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|05:19
|Press '''Enter''' and type: '''echo''' space within double quotes '''Hello world'''.

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|05:27
| Press '''Enter'''.Type: '''echo space dollar-sign SHELL''' (in Capital)

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|05:34
| press '''Enter.'''Type: '''echo space backtick date backtick'''

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|05:41
|'''backtick''' symbol is present on the key which has '''tilde''' character.

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|05:47
|Now, click on '''Save''' to save the file.

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|05:50
|Let us '''execute'''. Come back to our '''terminal'''.

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|05:55
| First, we have to make the file executable.

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| 05:58
| For this, type: '''chmod''' space '''plus x''' space '''hello underscore world dot sh'''

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|06:09
|and press''' Enter'''.

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|06:12
| Now, type:

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|06:14
|'''dot slash hello underscore world dot sh'''

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|06:19
|Press '''Enter.'''

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| 06:22
| You can see '''Hello World''' is displayed on the '''terminal'''.

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| 06:27
| The''' shell '''type is displayed on the next line. i.e '''slash bin slash bash'''

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| 06:32
| and day, month, time, time zone and year are displayed.

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|06:38
|The '''output''' may vary depending on the system.

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| 06:43
| Let us go back to our '''slides''' and summarize.

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|06:46
|In this tutorial, we have learnt about:

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|06:48
|Different types of '''Shells'''

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|06:50
| '''Bash Shell '''.'''Bash Shell script'''.

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|06:52
|To write a simple '''Shell script '''and to '''execute''' the script.

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| 06:57
| As an assignment- write a simple '''script''' to display the message -“'''Welcome to Bash learning'''”

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|07:03
| and''' “***************” ''' (asterisks) on separate line.

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| 07:06
| Watch the video available at the link shown below.

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|07:10
|It summarizes the Spoken-Tutorial project.

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|07:13
|If you do not have good bandwidth, you can download and watch it.

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|07:17
|The Spoken-Tutorial Project team:

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|07:20
|Conducts workshops using spoken tutorials.

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|07:22
|Gives certificates to those who pass an online test.

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|07:26
|For more details, please write to contact@spoken-tutorial.org

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|07:34
|Spoken Tutorial Project is a part of the "Talk to a Teacher" project.

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|07:39
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.

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|07:45
|More information on this mission is available at the link shown below. http://spoken-tutorial.org/NMEICT-Intro

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|07:51
|The script has been contributed by FOSSEE and Spoken-Tutorial teams.

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|07:56
|This is Ashwini Patil from IIT Bombay, signing off. Thank you for joining.

|}

BASH/C2/Introduction-to-BASH-Shell-Scripting/Khasi - Revision history

Meboreen Mary at 11:32, 30 April 2017

Meboreen Mary: Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 |Dear friends, welcome to the '''Spoken tutorial''' on '''Introduction to BASH shell scripting'''. |- |00:08 |In this t..."