Jyotisolanki at 07:04, 4 September 2017

2017-09-04T07:04:34Z

Jyotisolanki at 07:02, 4 September 2017

2017-09-04T07:02:56Z

Jyotisolanki: Created page with " {| Border=1 | '''Time''' | '''Narration''' |- | 00:01 |Welcome to the''' Spoken Tutorial''' on how to use '''Perl Module Library''' i.e. '''CPAN''' |- | 00:08 |In this tu..."

2016-08-04T05:43:35Z

Created page with " {| Border=1 | '''Time''' | '''Narration''' |- | 00:01 |Welcome to the''' Spoken Tutorial''' on how to use '''Perl Module Library''' i.e. '''CPAN''' |- | 00:08 |In this tu..."

New page

{| Border=1
| '''Time'''
| '''Narration'''

|-
| 00:01
|Welcome to the''' Spoken Tutorial''' on how to use '''Perl Module Library''' i.e. '''CPAN'''

|-
| 00:08
|In this tutorial, we will learn to use existing '''modules''' and create new modules in''' PERL'''.

|-
| 00:16
|To record this tutorial, I am using:
* '''Ubuntu Linux''' 12.04 operating system
* '''Perl''' 5.14.2 and
* ''''gedit' Text Editor'''.

|-
| 00:28
|You can use any text editor of your choice.

|-
| 00:32
|To follow this tutorial, you should have working knowledge of''' Perl''' programming.

|-
| 00:37
|If not, then go through the relevant''' Perl''' spoken tutorials on the''' spoken tutorial''' website.

|-
| 00:43
|'''Modules: '''
* These are code files that contain common routines
* That are written by different authors
* And, can be used by several programs at a time.

|-
| 00:55
|'''CPAN:'''
PERL is an '''open source''' language and anyone can contribute to PERL's standard '''CPAN library'''.

|-
| 01:03
| '''CPAN '''has thousands of ready-to-use modules written by different authors.

|-
|01:09
|The official website of '''CPAN '''is:
'''www.cpan.org'''

|-
| 01:17
|We will take''' List colon colon Util''' as an example and see how to use it.

|-
| 01:24
|This gives me access to the '''function'''s which are already written inside this module.

|-
| 01:30
|Switch to the''' terminal.'''

|-
| 01:32
|Type:''' perldoc List colon colon Util'''.

|-
| 01:38
| You may get an '''error''' saying '''You need to install the perl hyphen doc package to use this program'''.

|-
| 01:46
|This indicates, you need to install the '''perl hyphen doc''' package.

|-
| 01:50
|Do so using '''Synaptic Package Manager.'''

|-
| 01:55
|Please refer to the relevant''' Linux''' spoken tutorials on the''' spoken tutorial''' website.

|-
| 02:01
|What you see here is the documentation for the''' List colon colon Util''' module.

|-
| 02:08
|Note that the documentation contains-
* description of the module,
* example of how to use it
* and an '''overview'''.

|-
|02:20
|Hit the 'Q' key to exit the '''perldoc viewer'''.

|-
|02:25
|Next, we will see how to use''' List colon colon Util''' module in a '''Perl''' program.

|-
| 02:33
|Let me open a sample program''' exist underscore modules.pl''' which I have already saved.

|-
| 02:40
|In your''' exist underscore modules dot pl''' file, type the following code as displayed on the screen.

|-
| 02:47
|Let us understand the code now.

|-
| 02:50
|'''use List colon colon Util''' tells '''Perl''' to find and '''load''' the module '''List colon colon Util.'''

|-
| 03:00
|'''qw()''' function extracts words out of the '''string''' using a '''delimiter '''and returns the words as a '''list'''.

|-
| 03:09
| It is just a quick way of declaring an '''array'''.

|-
| 03:13
|While importing a '''module''', it '''import'''s only the '''subroutines''' specified in the '''list''' into our program.

|-
| 03:21
|It contains general-utility list of '''subroutines'''.

|-
| 03:26
|The module will '''export''' its '''subroutines '''and '''variables '''into our program.

|-
| 03:32
|The most popular '''subroutines '''available in''' List colon colon Util''' are:
'''first''' - which returns the first '''element''' in the '''list'''.

|-
| 03:42
|'''max''' –this returns the highest numerical value in the list.

|-
| 03:47
|'''maxstr'''- returns the highest '''string''' in the list.

|-
| 03:52
|'''min'''- this returns the lowest numerical value.

|-
| 03:57
|'''minstr''' – returns the lowest string in the list.

|-
| 04:02
|'''shuffle''' – this returns the values of the '''input''' in a random order.

|-
| 04:08
|'''sum''' – returns the numerical sum of all the elements in the list.

|-
| 04:14
|There is no need to write separate source code for each '''function'''.

|-
| 04:18
|We can just make use of these available '''subroutines''' in our program.

|-
| 04:23
|These are the '''input'''s I am passing to the function '''max, min, sum '''and''' shuffle.'''

|-
| 04:30
|And, these are the '''print '''statements.

|-
| 04:33
|Now, press''' Ctrl+S''' to '''save''' the file.

|-
| 04:37
|Let us '''execute''' the program.

|-
| 04:40
|Switch back to the terminal and type: '''perl exist underscore modules dot pl''' and press''' Enter'''.

|-
| 04:49
|Observe the '''output'''.

|-
| 04:51
|In '''Random number''', you may get any value between 0 and 51.

|-
| 04:58
|Next, we will see how to create a new '''Perl module''' and add it to '''CPAN'''.

|-
| 05:04
|Below are the steps to create a module:

|-
| 05:08
| Create a place to develop the module.

|-
| 05:11
| Create skeleton files for the module.

|-
| 05:14
| '''Document''' the module.

|-
| 05:16
| Write the '''Perl code'''.

|-
| 05:18
| Write the code for testing.

|-
| 05:20
| Distribute the '''module '''in '''CPAN'''.

|-
| 05:24
|'''Perl''' is distributed with a program called''' h2xs''' which is used to generate files for a new module.

|-
| 05:32
|'''Math colon colon Simple''' specifies our module name.

|-
| 05:37
|This is used to generate the directory which should clearly identify the module it contains.

|-
| 05:43
|Basically, it creates skeleton files for the module.
''' hyphen PAX''' are options that omit '''autoload''' and '''autogenerate'''.

|-
| 05:54
|Let's create a new module- '''Math colon colon Simple.'''

|-
| 05:59
|It will be provided with simple functions:''' add, subtract, multiply '''and '''divide'''.

|-
| 06:06
|Let us switch to terminal to execute the''' h2xs''' command.

|-
| 06:12
|Type: '''h2xs hyphen PAXn Math colon colon Simple'''.

|-
| 06:20
|The '''h2xs''' program generates all these files required to distribute the module.

|-
| 06:27
|Let us change directory to''' Math hyphen Simple'''.

|-
| 06:33
|Note the '''directory path''' on your machine. It may be as''' Math forward slash Simple'''.

|-
| 06:41
|Type "ls" to list all the files in the directory. We can see the following files.

|-
| 06:49
|The "Changes" file is where we will keep track of changes, made to our module, when we write new versions.

|-
| 06:58
|'''lib subdirectory '''contains the module.

|-
| 07:02
|'''MANIFEST''' contains a list of files in this directory.

|-
| 07:07
|'''Makefile''' is a Perl program used to create a '''Unix Makefile'''.
|-
| 07:12
|We will use this '''Makefile''' to test and install our module.

|-
| 07:18
|'''Test script'''s will be in''' 't' subdirectory.'''

|-
| 07:22
|The '''tests''' are simple '''Perl scripts''', but with a''' dot t extension''' used for '''unit testing'''.

|-
| 07:30
|'''Simple.pm''' is our module.

|-
| 07:34
|All these files are generated automatically when we execute the '''h2xs''' command.

|-
| 07:41
| Let us open the''' simple.pm''' file.

|-
| 07:45
|Change the directory to''' lib forward slash Math'''.

|-
| 07:51
|Now, we will open the''' simple.pm''' file to see the existing content.

|-
| 07:57
|Type:''' gedit Simple.pm'''.

|-
| 08:02
|What we see here is a documented, functional Perl module that doesn't do anything.

|-
| 08:09
|We have to write the required functions in this file to make it do something.

|-
| 08:16
|Add the below code after the text: "Preloaded methods go here".

|-
| 08:22
|Here, we will add four subroutines''' add, subtract, multiply '''and '''divide'''.

|-
| 08:29
|Now, press''' Ctrl+S''' to '''save''' the file.

|-
| 08:33
|Now, let's create a sample Perl program to test our code that makes sure it is working properly.

|-
| 08:41
|Let us open the test file''' Math-Simple.t''' under the subdirectory 't'.

|-
| 08:49
|Type: '''gedit Math-Simple.t'''

|-
| 08:55
|Add the following code after the existing code: “Insert your test code below..”.

|-
| 09:02
| The '''Print''' statements will print the output.

|-
| 09:06
|Now, press''' Ctrl+S''' to '''save''' the file.

|-
| 09:10
|Let us '''run''' the '''test script'''.

|-
| 09:13
|Type:''' perl Math-simple.t '''and press''' Enter.'''

|-
| 09:19
|We see this '''error''' message because the '''Perl '''script cannot find '''Simple.pm''' in its directory.

|-
| 09:27
|It should look inside the''' lib''' directory. How can we rectify this error?

|-
| 09:33
|Let us see a few options for this.

|-
| 09:37
|'''At the rate INC''' is a special variable that contains a list of directories.

|-
| 09:43
|Perl modules and '''libraries '''can be loaded from these directories.

|-
| 09:48
|This line of code tells the '''Perl''' program to add this '''directory path''' to its''' at the rate INC''' search directory.

|-
| 09:57
|Alternately, we can add files to''' at the rate INC''' at run time using '-I' option.

|-
| 10:06
|Now, let us switch to the terminal.

|-
| 10:10
|I will '''execute''' the program using the''' '-I' command line parameter'''.

|-
| 10:16
|So, I will type: '''perl -Ilib t/Math-Simple.t'''

|-
| 10:24
|Here is the output as expected.

|-
| 10:27
|We have tested the module and it is working fine.

|-
| 10:31
|Final step is to distribute the module.

|-
| 10:34
|The general procedure for installing module is to '''run''' these commands.

|-
| 10:40
|Installation involves copying files into the '''Perl library directory'''.

|-
| 10:45
|Most of us don't have permission to copy into this directory.

|-
| 10:49
|Since '''Math-Simple''' isn't a very useful module, I am not demonstrating the installation part.
|-
| 10:57
|This brings us to the end of this tutorial. Let us summarize.

|-
| 11:02
|In this tutorial, we learnt to:
* Use existing modules
* Create new modules
and how to use in the Perl program.

|-
| 11:11
|Here is an assignment for you.

|-
| 11:13
|Use the''' Text colon colon Wrap''' module.

|-
|11:17
| Make use of the''' Wrap()''' function which wraps the input text to form neat paragraphs.

|-
| 11:24
| '''Text colon colon Wrap''' module has a variable- "columns". Set the''' columns''' value to 30.

|-
| 11:31
| Print the text to see the formatted output.

|-
| 11:35
|The video at the following link summarizes the '''Spoken Tutorial''' project.
Please download and watch it.

|-
| 11:42
|The''' Spoken Tutorial Project''' team:
* conducts workshops using spoken tutorials
* and gives certificates on passing online tests.

|-
| 11:51
|For more details, please write to us.

|-
| 11:55
|Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.

|-
| 12:02
|More information on this mission is available at this link.

|-
| 12:06
|This is Nirmala Venkat from '''IIT Bombay''', signing off. Thanks for watching.
|}

@@ Line 14: / Line 14: @@
 |-
 | 00:16
-| આ ટ્યુટોરીયલ રિકોર્ડ કરવા માટે હું ઉપયોગ કરી રહી છું.
+| આ ટ્યુટોરીયલ રિકોર્ડ કરવા માટે હું ઉપયોગ કરી રહી છું. '''Ubuntu Linux''' 12.04 ઓપરેટિંગ સિસ્ટમ  '''Perl''' 5.14.2 અને  ''''gedit' Text Editor'''.
-* '''Ubuntu Linux''' 12.04 ઓપરેટિંગ સિસ્ટમ
-* '''Perl''' 5.14.2 અને
-* ''''gedit' Text Editor'''.
 |-
@@ Line 454: / Line 451: @@
 |-
 | 11:02
-|આ ટ્યુટોરીયલ માં આપણે
+|આ ટ્યુટોરીયલ માં આપણે વર્તમાન મોડ્યુલસ વાપરતા , નવા મોડ્યુલસ બનાવતા અને પર્લ પ્રોગ્રામ માં કેવા રીતે વપરાય છેતે શીખ્યા:
-* વર્તમાન મોડ્યુલસ વાપરતા
-* નવા મોડ્યુલસ બનાવતા
 અને પર્લ પ્રોગ્રામ માં કેવા રીતે વપરાય છેતે શીખ્યા:
 |-

PERL/C3/Perl-Module-Library-(CPAN)/Gujarati - Revision history

Jyotisolanki at 07:04, 4 September 2017

Jyotisolanki at 07:02, 4 September 2017

Jyotisolanki: Created page with " {| Border=1 | '''Time''' | '''Narration''' |- | 00:01 |Welcome to the''' Spoken Tutorial''' on how to use '''Perl Module Library''' i.e. '''CPAN''' |- | 00:08 |In this tu..."