Difference between revisions of "BASH/C2/Array-Operations-in-BASH/English-timed"
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| 00:01 | | 00:01 | ||
− | | Welcome to the spoken tutorial on '''Array operations in BASH ''' | + | | Welcome to the '''spoken tutorial''' on '''Array operations in BASH'''. |
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| 00:05 | | 00:05 | ||
− | | In this tutorial, we will learn how to | + | | In this tutorial, we will learn how to: |
* Declare an ''' Array''' and assign value to it. | * Declare an ''' Array''' and assign value to it. | ||
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| 00:12 | | 00:12 | ||
− | | * Initialize an''' Array''' during declaration | + | | * Initialize an''' Array''' during declaration. |
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| 00:15 | | 00:15 | ||
− | | * To find length of an ''' Array''' and its | + | | * To find length of an ''' Array''' and its n'th '''element'''. |
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| 00:20 | | 00:20 | ||
− | | * To print an '''Array''' | + | | * To print an '''Array'''. |
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| 00:27 | | 00:27 | ||
− | | For relevant tutorials please visit | + | | For relevant tutorials, please visit: spoken hyphen tutorial dot org. |
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| 00:33 | | 00:33 | ||
− | |For this tutorial I am using | + | |For this tutorial, I am using: |
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| 00:45 | | 00:45 | ||
− | | '''GNU Bash '''version | + | | '''GNU Bash '''version 4 or above is recommended for practice. |
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| 00:55 | | 00:55 | ||
− | | * An '''Array''' is a variable with multiple values. | + | | * An '''Array''' is a '''variable''' with multiple '''values'''. |
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| 01:01 | | 01:01 | ||
− | | * The values can be of same or different types | + | | * The values can be of same or different types. |
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| 01:04 | | 01:04 | ||
− | | * There is no maximum limit for the size of an '''array''' | + | | * There is no maximum limit for the '''size''' of an '''array'''. |
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| 01:08 | | 01:08 | ||
− | | * '''Array''' members need not be consecutive | + | | * '''Array''' members need not be consecutive. |
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| 01:12 | | 01:12 | ||
− | | * '''Array index''' always starts with '''zero''' | + | | * '''Array index''' always starts with '''zero'''. |
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| 01:16 | | 01:16 | ||
− | | We will now see how to declare and assign a value to an '''Array'''. | + | | We will now see how to declare and assign a '''value''' to an '''Array'''. |
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| 01:21 | | 01:21 | ||
− | | The syntax to declare an '''Array''' is - | + | | The syntax to declare an '''Array''' is- |
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| 01:31 | | 01:31 | ||
− | | It is a built-in command in '''Bash'''. | + | | It is a built-in '''command''' in '''Bash'''. |
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| 01:38 | | 01:38 | ||
− | | '''Name within square brackets index equals to within single quotes value.''' | + | | '''Name''' within square brackets '''index''' equals to within single quotes '''value.''' |
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| 01:46 | | 01:46 | ||
− | | Now let see how to initialize an '''Array''' during declaration. | + | | Now, let see how to initialize an '''Array''' during declaration. |
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| 01:56 | | 01:56 | ||
− | |* | + | |* '''Elements''' Should be separated by a '''space''' . |
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| 02:00 | | 02:00 | ||
− | | Each element should be within '''parentheses'''. | + | | Each '''element''' should be within '''parentheses'''. |
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| 02:03 | | 02:03 | ||
− | | The syntax is '''declare hyphen `a` arrayname equal | + | | The syntax is '''declare hyphen `a` arrayname equal to within round brackets within single quotes 'element1' , 'element2'''' and '''element3''' . |
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| 02:36 | | 02:36 | ||
− | | We use the ampersand to free up the prompt. Press Enter | + | | We use the ampersand to free up the prompt. Press '''Enter'''. |
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| 02:41 | | 02:41 | ||
− | | Type the code as shown here in your ''' array.sh '''file'''. | + | | Type the '''code''' as shown here, in your ''' array.sh '''file'''. |
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* '''Redhat, ''' | * '''Redhat, ''' | ||
* '''Ubuntu and ''' | * '''Ubuntu and ''' | ||
− | * '''Fedora''' | + | * '''Fedora'''. |
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| 02:57 | | 02:57 | ||
− | | Here | + | | Here hyphen `a` is a '''flag.''' |
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| 03:05 | | 03:05 | ||
− | | Let us switch back to the slides. | + | | Let us switch back to the '''slides'''. |
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| 03:12 | | 03:12 | ||
− | | | + | | Dollar sign opening curly bracket hash '''arrayname''' within square bracket At sign (@) and closing curly bracket. |
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| 03:22 | | 03:22 | ||
− | | The length of the ''' | + | | The length of the n'th '''element''' can be obtained by this syntax: |
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| 03:28 | | 03:28 | ||
− | | | + | | Dollar sign opening curly bracket hash arrayname within square brackets `n` and closing curly bracket. |
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| 03:37 | | 03:37 | ||
− | | Here | + | | Here 'n' is the '''element''' number whose length is to be found. |
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| 03:48 | | 03:48 | ||
− | | | + | | Dollar sign opening curly bracket '''arrayname''' within square brackets `At sign` and closing curly bracket.''' |
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| 04:40 | | 04:40 | ||
− | | Now switch to the '''Terminal.''' | + | | Now, switch to the '''Terminal.''' |
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| 04:56 | | 04:56 | ||
− | | Type | + | | Type: '''dot slash array .sh'''. Press '''Enter.''' |
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| 05:04 | | 05:04 | ||
− | |The number of elements or the length of the '''Array `Linux`''' is | + | |The number of elements or the length of the '''Array `Linux`''' is four. |
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| 05:18 | | 05:18 | ||
− | | The | + | | The 3rd element of '''Array Linux''' is ''' Ubuntu'''. |
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| 05:22 | | 05:22 | ||
− | | And the number of characters in the | + | | And the number of characters in the third element is six, as expected. |
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| 05:29 | | 05:29 | ||
− | | This | + | | This brings us to the end of this tutorial. |
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| 05:32 | | 05:32 | ||
− | | Let us summarize. Come back to our slides. | + | | Let us summarize. Come back to our '''slides'''. |
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| 05:35 | | 05:35 | ||
− | | In this tutorial we learnt to | + | | In this tutorial, we learnt to: |
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| 05:51 | | 05:51 | ||
− | | * To print whole ''' Array''' | + | | * To print whole ''' Array'''. |
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| 05:53 | | 05:53 | ||
− | |As an assignment | + | |As an assignment- |
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| 05:55 | | 05:55 | ||
− | | Declare an array '''names''' of length | + | | Declare an array '''names''' of length 7 and find: |
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| 06:04 | | 06:04 | ||
− | |* And print the 5th element | + | |* And print the 5th element. |
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| 06:06 | | 06:06 | ||
− | |Watch the video available at the link shown below | + | |Watch the video available at the link shown below. |
|- | |- | ||
| 06:10 | | 06:10 | ||
− | | It | + | | It summarizes the Spoken-Tutorial project. |
|- | |- | ||
| 06:13 | | 06:13 | ||
− | | If you do not have good bandwidth, you can download and watch it | + | | If you do not have good bandwidth, you can download and watch it. |
|- | |- | ||
| 06:18 | | 06:18 | ||
− | | The Spoken Tutorial Project | + | | The Spoken Tutorial Project team: |
|- | |- | ||
| 06:20 | | 06:20 | ||
− | | Conducts workshops using spoken tutorials | + | | Conducts workshops using spoken tutorials. |
|- | |- | ||
| 06:24 | | 06:24 | ||
− | | Gives certificates to those who pass an online test | + | | Gives certificates to those who pass an online test. |
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| 06:35 | | 06:35 | ||
− | |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 |
|- | |- | ||
| 06:40 | | 06:40 | ||
− | | It is supported by the National Mission on Education through ICT, MHRD, Government of India | + | | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
|- | |- | ||
| 06:47 | | 06:47 | ||
− | | More information on this | + | | More information on this mission is available at the link shown below. |
|- | |- | ||
| 06:52 | | 06:52 | ||
− | | The script has been contributed by FOSSEE and spoken-tutorial | + | | The script has been contributed by FOSSEE and spoken-tutorial teams. |
|- | |- |
Revision as of 14:39, 2 July 2015
Title of script: Array Operations In BASH
Author: Lavitha Pereira
Keywords: Video tutorial, Bash shell, Array
Time | Narration |
---|---|
00:01 | Welcome to the spoken tutorial on Array operations in BASH. |
00:05 | In this tutorial, we will learn how to:
|
00:12 | * Initialize an Array during declaration. |
00:15 | * To find length of an Array and its n'th element. |
00:20 | * To print an Array. |
00:22 | To follow this tutorial, You should be familiar with Linux Operating System. |
00:27 | For relevant tutorials, please visit: spoken hyphen tutorial dot org. |
00:33 | For this tutorial, I am using: |
00:37 | * Ubuntu Linux 12.04 OS |
00:41 | * GNU Bash version 4.1.10 |
00:45 | GNU Bash version 4 or above is recommended for practice. |
00:50 | Let us start with the definition of an Array and its characteristics. |
00:55 | * An Array is a variable with multiple values. |
01:01 | * The values can be of same or different types. |
01:04 | * There is no maximum limit for the size of an array. |
01:08 | * Array members need not be consecutive. |
01:12 | * Array index always starts with zero. |
01:16 | We will now see how to declare and assign a value to an Array. |
01:21 | The syntax to declare an Array is- |
01:24 | declare hyphen `a` arrayname |
01:28 | “declare” keyword is used to declare an Array. |
01:31 | It is a built-in command in Bash. |
01:35 | The syntax to assign a value to an Array is- |
01:38 | Name within square brackets index equals to within single quotes value. |
01:46 | Now, let see how to initialize an Array during declaration. |
01:51 | * Array can be declared and initialized at the same time. |
01:56 | * Elements Should be separated by a space . |
02:00 | Each element should be within parentheses. |
02:03 | The syntax is declare hyphen `a` arrayname equal to within round brackets within single quotes 'element1' , 'element2' and element3 . |
02:19 | Let us try an example. |
02:21 | Open the terminal by pressing Ctrl+Alt and T keys simultaneously. |
02:28 | Now Type: gedit space array.sh space & |
02:36 | We use the ampersand to free up the prompt. Press Enter. |
02:41 | Type the code as shown here, in your array.sh file. |
02:47 | This line declares an Array named Linux with elements -
|
02:57 | Here hyphen `a` is a flag. |
03:00 | It allows us to read and assign values to an Array. |
03:05 | Let us switch back to the slides. |
03:07 | The length of an Array can be obtained by this syntax: |
03:12 | Dollar sign opening curly bracket hash arrayname within square bracket At sign (@) and closing curly bracket. |
03:22 | The length of the n'th element can be obtained by this syntax: |
03:28 | Dollar sign opening curly bracket hash arrayname within square brackets `n` and closing curly bracket. |
03:37 | Here 'n' is the element number whose length is to be found. |
03:42 | All the elements of the Array can be printed using this syntax. |
03:48 | Dollar sign opening curly bracket arrayname within square brackets `At sign` and closing curly bracket. |
03:57 | Now come back to the text editor. |
04:00 | This line will display total number of elements in the Array Linux. |
04:06 | hyphen `e` enables interpretation of backslash escapes. |
04:11 | We have included this as we have backslash `n` at the end of the line. |
04:18 | The next line displays all the elements of the Array Linux. |
04:23 | This line displays the 3rd element of the Array Linux. |
04:28 | Please note that an Array always starts with index zero. |
04:34 | Lastly, this line displays the number of characters present in the 3rd element. |
04:40 | Now, switch to the Terminal. |
04:42 | Let's first make the file executable by typing chmod space plus x space array.sh. Press Enter. |
04:56 | Type: dot slash array .sh. Press Enter. |
05:01 | The output is displayed. |
05:04 | The number of elements or the length of the Array `Linux` is four. |
05:10 | The elements of the Array Linux are Debian, Redhat, Ubuntu and Fedora. |
05:18 | The 3rd element of Array Linux is Ubuntu. |
05:22 | And the number of characters in the third element is six, as expected. |
05:29 | This brings us to the end of this tutorial. |
05:32 | Let us summarize. Come back to our slides. |
05:35 | In this tutorial, we learnt to: |
05:40 | * Declare and assign values to an Array |
05:43 | * Initialize an Array during declaration |
05:46 | * To find length of an Array and its nth element and |
05:51 | * To print whole Array. |
05:53 | As an assignment- |
05:55 | Declare an array names of length 7 and find: |
06:00 | * the total number of elements |
06:02 | * print all the elements |
06:04 | * And print the 5th element. |
06:06 | Watch the video available at the link shown below. |
06:10 | It summarizes the Spoken-Tutorial project. |
06:13 | If you do not have good bandwidth, you can download and watch it. |
06:18 | The Spoken Tutorial Project team: |
06:20 | Conducts workshops using spoken tutorials. |
06:24 | Gives certificates to those who pass an online test. |
06:27 | For more details, please write to contact@spoken-tutorial.org. |
06:35 | Spoken Tutorial Project is a part of the "Talk to a Teacher" project |
06:40 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
06:47 | More information on this mission is available at the link shown below. |
06:52 | The script has been contributed by FOSSEE and spoken-tutorial teams. |
06:58 | This is Ashwini Patil from IIT Bombay. |
07:02 | Thank you for joining. |