Difference between revisions of "BASH/C2/More-on-Arrays/English-timed"

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| * Extract an element from an ''' Array'''
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| * Extract an element from an ''' array'''
  
 
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|  00:13
 
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| * Replace an element in an ''' Array'''  
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| * Replace an element in an ''' array'''  
  
 
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|  00:16
 
|  00:16
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| * Add an element to an ''' Array''' and
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| * Add an element to an ''' array''' and
  
 
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|  00:19
 
|  00:19
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| * Remove an element from an ''' Array'''.
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| * Remove an element from an ''' array'''.
  
 
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|  00:22
 
|  00:22
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|  To follow this tutorial, You should be familiar with the '''Linux Operating System.'''
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|  To follow this tutorial, you should be familiar with the '''Linux Operating System.'''
  
 
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|  00:28
 
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| If not, for relevant tutorials please visit our website which is as shown.
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| If not, for relevant tutorials, please visit our website which is as shown.
  
 
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| Let us see how to extract an '''element''' from an '''Array'''.
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| Let us see how to extract an '''element''' from an '''array'''.
  
 
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|  00:55
 
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|  The elements in an ''' Array''' can be extracted from any position.
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|  The elements in an ''' array''' can be extracted from any position.
  
 
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| Note that ''' index number''' always starts from ''' zero'''.
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| Note that ''' index number''' always starts from zero.
  
 
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| 01:12  
 
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| '''ArrayName''' within square bracket At sign colon '''position''' colon '''Number of elements''' to be extracted from the position mentioned.
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| '''ArrayName''' within square bracket "At" sign colon '''position''' colon '''Number of elements''' to be extracted from the position mentioned.
  
 
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|  Now type the '''code''' as shown here, in your '''array2.sh file.'''
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|  Now type the '''code''' as shown here, in your "array2.sh" file.
  
 
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| This '''declare command ''' declares an '''array ''' named '''Linux ''' with elements-  
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| This''' "declare" command ''' declares an '''array ''' named '''Linux ''' with elements-  
  
 
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| 02:06
 
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| * '''Debian'''
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| * "Debian"
  
 
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| * '''Redhat '''
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| * "Redhat"
  
 
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| 02:08
 
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| * '''Ubuntu''' and  
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| * "Ubuntu" and  
  
 
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| 02:09
 
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| * '''Fedora'''.
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| * "Fedora".
  
 
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| 02:11
 
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| This '''echo command''' will '''print''' the list of all the elements in the '''array'''.
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| This '''"echo" command''' will '''print''' the list of all the elements in the '''array'''.
  
 
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| The next '''echo command''' will print the extracted elements.
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| The next''' "echo" command''' will print the extracted elements.
  
 
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| First let's make the file executable by typing '''chmod''' space '''plus x space array2.sh'''. Press '''Enter.'''
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| First, let's make the file executable by typing '''chmod''' space '''plus x space array2.sh'''. Press '''Enter.'''
  
 
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|  We get the output - '''Original elements in an array Linux: Debian Redhat Ubuntu and Fedora'''.
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|  We get the output -''' "Original elements in an array Linux: Debian Redhat Ubuntu Fedora".'''
 
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|  '''The two elements starting from index one(Redhat): Redhat''' and '''Ubuntu'''
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|  ''' "The two elements starting from index one(Redhat): Redhat Ubuntu".'''
  
 
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| '''ArrayName''' within square brackets n equals to within single quote, '''NewWord.'''
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| '''ArrayName''' within square brackets 'n' equals to within single quote '''NewWord.'''
  
 
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| This command will replace the third element '''Ubuntu''' with '''Mandriva.'''
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| This command will replace the third element "Ubuntu" with "Mandriva".
  
 
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| This '''echo command''' will display all elements of '''array Linux''' after replacement.
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| This '''echo''' command will display all elements of array '''Linux''' after replacement.
  
 
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| Let's execute again.
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| Let's '''execute''' again.
  
 
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| This displays all elements after replacement : Debian Redhat Mandriva and Fedora .
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| This displays- "All elements after replacement : Debian Redhat Mandriva Fedora" .
  
 
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| '''ArrayName''' equal to opening round bracket within double quotes dollar sign opening curly bracket '''ArrayName''' opening square bracket At sign closing square bracket closing curly bracket
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| '''ArrayName''' equal to opening round bracket within double quotes dollar sign opening curly bracket '''ArrayName''' opening square bracket "At" sign closing square bracket closing curly bracket
−
 
+
 
space within double quotes '''New_Word_1''' space within double quotes '''New_Word_2''' and closing round bracket.
 
space within double quotes '''New_Word_1''' space within double quotes '''New_Word_2''' and closing round bracket.
  
 
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|  Let us understand this with the help of our example.  
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|  Let us understand this with the help of one example.  
  
 
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| Switch to the '''code file'''.
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| Switch to the code file.
  
 
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| The highlighted '''command''' will '''append ''' a new '''element Suse''' to the '''array Linux'''.
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| The highlighted '''command''' will '''append ''' a new element''' "Suse" ''' to the '''array Linux'''.
  
 
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| Then we will '''echo''' all the elements after appending '''Suse'''.
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| Then we will '''echo''' all the elements after appending "Suse".
  
 
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| Let us switch to the '''code file'''.
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| Let us switch to the code file.
  
 
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| # Declare an''' array''' names2 of length 7 and perform following operations.
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| # Declare an array '''names2''' of length 7 and perform following operations.
  
 
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| * Extract three elements starting from index two.
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| * Extract three elements, starting from index two.
  
 
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| Append any new name at the end of''' Array'''.
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| Append any new name at the end of array.
 
   
 
   
 
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| Conducts workshops using spoken tutorials.  
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|* Conducts workshops using spoken tutorials.  
  
 
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| Gives certificates to those who pass an online test.  
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|* Gives certificates to those who pass an online test.  
  
 
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| Spoken Tutorial Project is a part of the "Talk to a Teacher" project.
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| '''Spoken Tutorial''' Project is a part of the '''Talk to a Teacher''' project.
  
 
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| The script has been contributed by FOSSEE and spoken-tutorial team.
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| The script has been contributed by FOSSEE and spoken-tutorial teams.
  
 
|-
 
|-

Revision as of 11:48, 10 July 2015

Title of script: More on Arrays in BASH Shell Scripting

Author: Lavitha Pereira

Keywords: video tutorial, Bash shell, Array


Time Narration
00:02 Welcome to the spoken tutorial on More on Arrays in BASH.
00:07 In this tutorial, we will learn to:
00:10 * Extract an element from an array
00:13 * Replace an element in an array
00:16 * Add an element to an array and
00:19 * Remove an element from an array.
00:22 To follow this tutorial, you should be familiar with the Linux Operating System.
00:28 If not, for relevant tutorials, please visit our website which is as shown.
00:34 For this tutorial, I am using
  • Ubuntu Linux 12.04 OS and
00:41 * GNU Bash version 4.1.10
00:45 GNU Bash version 4 or above is recommended for practice.
00:50 Let us see how to extract an element from an array.
00:55 The elements in an array can be extracted from any position.
01:00 Here, position is the index number.
01:04 Note that index number always starts from zero.
01:09 The syntax is as follows:
01:12 ArrayName within square bracket "At" sign colon position colon Number of elements to be extracted from the position mentioned.
01:25 Let us understand with the help of an example.
01:29 Open the terminal by pressing Ctrl+Alt and T keys simultaneously on your keyboard.
01:37 Type: gedit space array2.sh space & (ampersand sign). Press Enter.
01:47 Now type the code as shown here, in your "array2.sh" file.
01:54 Let me explain the program.
01:56 This is the Shebang line.
01:59 This "declare" command declares an array named Linux with elements-
02:06 * "Debian"
02:07 * "Redhat"
02:08 * "Ubuntu" and
02:09 * "Fedora".
02:11 This "echo" command will print the list of all the elements in the array.
02:16 The next "echo" command will print the extracted elements.
02:21 The command ${Linux[@]:1:2} will print two elements starting from index 'one' which is "Redhat".
02:34 Now switch to the Terminal.
02:36 First, let's make the file executable by typing chmod space plus x space array2.sh. Press Enter.
02:50 Type: dot slash array2.sh press Enter.
02:56 We get the output - "Original elements in an array Linux: Debian Redhat Ubuntu Fedora".
03:06 "The two elements starting from index one(Redhat): Redhat Ubuntu".
03:12 Let us switch back to the slides.
03:15 We will see how to replace an element in an array .
03:19 An existing element in an array can be replaced using the following syntax.
03:25 ArrayName within square brackets 'n' equals to within single quote NewWord.
03:34 Here 'n' is the index number or element number.
03:38 Come back to our text editor.
03:41 Linux[2]='Mandriva' .
03:45 This command will replace the third element "Ubuntu" with "Mandriva".
03:51 This echo command will display all elements of array Linux after replacement.
03:58 Come back to our Terminal.
04:01 Let's execute again.
04:04 This displays- "All elements after replacement : Debian Redhat Mandriva Fedora" .
04:12 Now, switch to the slides.
04:14 We will see how to add an element to an array.
04:18 ArrayName equal to opening round bracket within double quotes dollar sign opening curly bracket ArrayName opening square bracket "At" sign closing square bracket closing curly bracket

space within double quotes New_Word_1 space within double quotes New_Word_2 and closing round bracket.

04:45 Let us understand this with the help of one example.
04:50 Switch to the code file.
04:52 The highlighted command will append a new element "Suse" to the array Linux.
04:59 Then we will echo all the elements after appending "Suse".
05:05 Switch to the terminal.
05:07 Let me clear the prompt.
05:09 We will execute the program again.
05:12 The output is displayed: All elements after appending Suse : Debian Redhat Mandriva Fedora and Suse.
05:22 Now, come back to our slides.
05:24 We will see how to remove an element from an array.
05:29 An element can be removed from an array by using the following syntax -
05:35 unset space ArrayName opening square bracket index number closing square bracket.
05:44 Let us switch to the code file.
05:46 Here, we are using the unset command.
05:50 And we will remove the third element Mandriva from the array Linux.
05:56 Then we will echo all the elements again after the removal of Mandriva.
06:02 Now switch to the terminal.
06:04 We will execute the program.
06:07 Here is the list of elements after removing Mandriva.
06:12 Debian Redhat Fedora and Suse
06:16 This brings us to the end of this tutorial.
06:19 Come back to our slides.
06:21 Let us summarize.
06:23 In this tutorial, we learned to:
06:25 * Extract an element from an array
06:28 * Replace an element in an array
06:30 * Add element to an array and
06:32 * Remove element from an array.
06:36 As an assignment-
06:37 # Declare an array names2 of length 7 and perform following operations.
06:44 * Extract three elements, starting from index two.
06:48 * Replace third element with Debian and display.
06:55 Append any new name at the end of array.
06:58 Watch the video available at the link shown below.
07:01 It summarizes the Spoken Tutorial project.
07:04 If you do not have good bandwidth, you can download and watch it.
07:09 The Spoken Tutorial Project team:
07:12 * Conducts workshops using spoken tutorials.
07:15 * Gives certificates to those who pass an online test.
07:19 For more details, please write to contact@spoken-tutorial.org
07:27 Spoken Tutorial Project is a part of the Talk to a Teacher project.
07:31 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:38 More information on this mission is available at the link shown below.
07:44 The script has been contributed by FOSSEE and spoken-tutorial teams.
07:50 This is Ashwini Patil from IIT Bombay, signing off.
07:55 Thank you for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Pratik kamble, Ranjana, Sandhya.np14

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