Difference between revisions of "BASH/C2/Introduction-to-BASH-Shell-Scripting/English"
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| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| '''C Shell'''- '''/bin/csh''' | | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| '''C Shell'''- '''/bin/csh''' | ||
| − | + | It provides features lacking in Bourne Shell | |
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| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| '''K Shell- /bin/ksh''' | | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| '''K Shell- /bin/ksh''' | ||
| − | + | It was created by David Korn | |
| − | + | ||
| + | It has features of both B Shell and C Shell, along with some additional features. | ||
Latest revision as of 12:49, 26 July 2013
Title of script: Introduction to BASH shell scripting
Author: FOSSEE and Spoken-tutorial Team
Keywords: video tutorial, Bash shell, hello world, execute a script
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| Display Slide | Dear friends, welcome to the spoken tutorial on Introduction to BASH shell scripting. |
| Display Slide
Learning Objectives |
In this tutorial, we will learn
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| Display Slide
Prerequisites
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To follow this tutorial you should be familiar with Linux Operating System
If not, then for relevant Linux tutorials, please visit our website. |
| Display slide | For this tutorial I am using
GNU bash version 4 or above is recommended to practice this tutorial. |
| Display slide
Bash Shell |
Let us see what a Bash Shell is.
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| Let me show you what is a Bash Shell. | |
| Press Ctrl+Alt+T | Open the terminal by pressing
Ctrl+Alt+T keys simultaneously . This will open the 'Gnome-terminal'. |
| On the Terminal, type -
echo $SHELL
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To check which type of shell we are using, type:
echo space dollar sign SHELL('shell' in capital)
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| Highlight
/bin/bash |
You will see the output printed on the next line as:
slash bin slash bash This indicates that we are using the Bash Shell. |
| Display Slide
Different Types of Shells Bourne Shell- /bin/sh |
Let us know different types of Shells available
Bourne Shell- /bin/sh
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| C Shell- /bin/csh | C Shell- /bin/csh
It provides features lacking in Bourne Shell
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| K Shell- /bin/ksh
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K Shell- /bin/ksh
It was created by David Korn It has features of both B Shell and C Shell, along with some additional features.
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| Bash Shell- /bin/bash | Bash Shell- /bin/bash
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| Display Slide
TC Shell- /bin/tcsh
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TC Shell- /bin/tcsh
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| Z Shell- /bin/zsh | Z shell- /bin/zsh
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| Display Slide
Bash Shell script |
Now let us see what a Bash Shell script is.
The Bash Shell script
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| Let us see how to write a simple Bash script.
Let us test the echo command, which will print Hello World on the terminal. | |
| Switch to the terminal >> type
echo “Hello World”
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Let's go to the terminal and type:
echo space open double quotes Hello space world close double quotes
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| Output: Hello World | This prints Hello World on the terminal. |
| The command worked as expected. | |
| Highlight echo “Hello World” | Now, what if we want to use this command in a file? |
| Just put this command in a file and execute that file. | |
| So, let us write a simple “hello world” script. | |
| We will use gedit text-editor for this purpose.
You are free to use your favourite text-editor. | |
| Switch to the terminal >> type cd Desktop >> press Enter | I want to create my file on the Desktop.
cd space Desktop
|
| Type gedit hello_world.sh >> press Enter | Now type
gedit space hello underscore world dot sh
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| Point to the header of the gedit window | We have opened a new file named hello_world.sh using gedit. |
| Type #!/bin/bash
>> press Enter |
In this file, type
hash exclamation slash bin slash bash
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| Highlight this line | This is the first line of every bash script.
It is called shebang or bang line. |
| Type # my first Bash script
>> press Enter |
Now, let's add a comment to the file by typing:
hash my space first space Bash space script
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| Highlight #
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Remember that any line after hash, is treated as a comment.
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| Type echo “Hello World”
>> press Enter
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Now we can add the command which we used earlier.
echo space open double quotes Hello space world close double quotes
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| Type echo $SHELL
>>Press Enter |
Also in the next line, type:
echo space dollar sign SHELL And press Enter. |
| Type echo `date`
>> Press Enter |
Then type:
echo space backtick date backtick
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| Press CTRL+S | Press CTRL+S to save this file.
We will close this file using ALT+F4. |
| Switch to the terminal | Now, let's go back to the terminal and make this file executable. |
| Type
chmod +x hello_world.sh >> press Enter |
So, type
chmod space plus x space hello underscore world dot sh
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| Type
./ hello_world.sh >> press Enter
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Now execute this file by typing
dot slash hello underscore world dot sh Press Enter. |
| Output: Hello World
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You can see Hello World displayed on the terminal. |
| Output: /bin/bash | The shell type is displayed on the next line. ie slash bin slash bash |
| Output: Wed May 8 15:59:36 IST 2013 | We can see that Day, Month, Time, Time zone and Year are displayed.
The output may vary depending on the system. |
| Display Slide | Summary
In this tutorial we have learnt about
We also wrote a simple Shell script and executed it. |
| Display Slide
Assignment |
Write a simple Bash shell script to display the message -
on separate lines. |
| Display Slide
Acknowledgement Slide |
Watch the video available at the following link
It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it |
| Display Slide
Spoken Tutorial Workshops |
The Spoken Tutorial Project Team
Conducts workshops using spoken tutorials Gives certificates to those who pass an online test
contact@spoken-tutorial.org |
| Display Slide
Acknowledgement |
Spoken Tutorial Project is a part of the Talk to a Teacher project
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 |
| The script for this tutorial was written by the FOSSEE and Spoken Tutorial Teams, IIT Bombay.
Thank you for joining. |
