Nirmala Venkat: Created page with "'''>>Title of script''':''' Downloading CPAN modules''' '''Author: Nirmala Venkat''' '''Keywords: Perl Module Library (CPAN), cpan modules on linux, cpan modules on windows,..."

2015-12-23T09:39:27Z

Created page with "'''>>Title of script''':''' Downloading CPAN modules''' '''Author: Nirmala Venkat''' '''Keywords: Perl Module Library (CPAN), cpan modules on linux, cpan modules on windows,..."

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'''>>Title of script''':''' Downloading CPAN modules'''

'''Author: Nirmala Venkat'''

'''Keywords: Perl Module Library (CPAN), cpan modules on linux, cpan modules on windows, ppm (Perl Package Module), modules, PERL, PERL programming, video tutorial'''

{| style="border-spacing:0;"
| style="background-color:#c0c0c0;border:1pt solid #000000;padding:0.097cm;"| '''Visual Cue'''
| style="background-color:#c0c0c0;border:1pt solid #000000;padding:0.097cm;"| '''Narration'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 1:

| style="border:1pt solid #000000;padding:0.097cm;"| Welcome to the''' Spoken Tutorial''' on''' Downloading CPAN modules.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 2:

Learning objectives

| style="border:1pt solid #000000;padding:0.097cm;"| In this tutorial we will learn how to download required '''CPAN modules '''in

* '''Ubuntu Linux OS '''and
* '''Windows OS'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 3:

System Requirements
| style="border:1pt solid #000000;padding:0.097cm;"| To record this tutorial, I am using

* '''Ubuntu Linux 12.04''' operating system
* '''Windows 7'''
* '''Perl 5.14.2 and'''
* '''gedit''' Text Editor

You can use any text editor of your choice.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 4:

Pre-requisites

| style="border:1pt solid #000000;padding:0.097cm;"| To follow this tutorial, you should have working knowledge of''' Perl''' programming.

If not, then go through the relevant''' Perl''' spoken tutorials on the''' spoken tutorial''' website.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| First we will learn how to download '''CPAN modules''' in''' Ubuntu Linux OS'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Switch to the terminal
| style="border:1pt solid #000000;padding:0.097cm;"| Switch to the '''terminal'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| '''$ sudo cpan'''
| style="border:1pt solid #000000;padding:0.097cm;"| Type '''sudo''' space''' cpan''' and press '''Enter.'''

Enter the password if required.

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"|
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| If cpan is not installed in your system, it will prompt you for the installation process.

Please proceed with the steps.

Your computer must be connected to the internet for the installation process.

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| '''<nowiki>cpan[1]></nowiki>'''
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| We can see the prompt changes to''' cpan'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 5:

Example : CPAN Module

Module:

'''Text::CSV '''
| style="border:1pt solid #000000;padding:0.097cm;"| Say for example, I want to extract some data from a '''CSV file''' and use in my '''Perl''' program.

For this, we will use''' Text:: CSV '''module.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Before using, we have to install the''' Text::CSV module'''

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"|
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| Switch to the terminal.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| '''<nowiki>cpan[1]> Install Text::CSV</nowiki>'''
| style="border:1pt solid #000000;padding:0.097cm;"| Type''' Install Text::CSV''' and press '''Enter.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| We can see the installation of corresponding packages of this '''module'''.

Installation will take sometime to complete depending upon your internet speed.

<nowiki><<</nowiki>PAUSE>>

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Now let us check whether the '''module''' is installed successfully or not.

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"|
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| Hit the 'q' key to exit cpan.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| $''' instmodsh'''
| style="border:1pt solid #000000;padding:0.097cm;"| Type''' instmodsh''' and press '''Enter'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| $''' l'''
| style="border:1pt solid #000000;padding:0.097cm;"| Type''' l''' to list all installed '''modules'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Highlight''' Install Text::CSV'''
| style="border:1pt solid #000000;padding:0.097cm;"| Here we can see''' Text::CSV, '''which shows that the modules is installed in our system.

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"|
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| Type 'q' to exit.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| $ gedit candidates.csv
| style="border:1pt solid #000000;padding:0.097cm;"| Now I will open the '''candidates.csv '''which i have already saved.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| In terminal >> type''' gedit candidates.csv''' and press''' Enter'''.
| style="border:1pt solid #000000;padding:0.097cm;"| Type gedit '''candidates.csv '''and press''' Enter.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Highlight the data
| style="border:1pt solid #000000;padding:0.097cm;"| Here we can see name, age, gender and email details of the candidates with a comma separator.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Point the file in gedit
| style="border:1pt solid #000000;padding:0.097cm;"| Now I will open '''csvtest.pl''' file in which I have written a '''Perl''' program that uses this '''module'''.

This program will extract the name field values which are stored in the''' csv file.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| <nowiki>#!/usr/bin/perl</nowiki>

use Text::CSV<nowiki>; </nowiki>
| style="border:1pt solid #000000;padding:0.097cm;"| '''use '''statement loads the '''Text::CSV module.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| my $file = "candidates.csv";

open my $fh<nowiki>, "<", $</nowiki>file or die "$file: $!";

| style="border:1pt solid #000000;padding:0.097cm;"| I have declared the '''candidates.csv''' file to a '''local variable''' dollar '''file'''.

The next statement will open the file in '''READ''' mode'''.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| my $csv = Text::CSV->new ({sep_char<nowiki>=>','});</nowiki>

| style="border:1pt solid #000000;padding:0.097cm;"| '''Text::CSV''' is the class and we can create an instance, by calling the constructor with '''new.'''

This line creates an object setting the separator character to be comma (,).

|-
| style="border:1pt solid #000000;padding:0.097cm;"| while (my $row = $csv->getline ($fh)) {

print "$row<nowiki>->[0]\</nowiki>n";

}
close $fh<nowiki>;</nowiki>
| style="border:1pt solid #000000;padding:0.097cm;"| Here, '''while''' loop fetches the data line by line using the '''getline''' '''method'''.

'''getline''' '''method''' returns a '''reference''' to an array.

We need to '''dereference''' it, to fetch the value.

<nowiki>[0] - </nowiki>Index of zero represents the name field in the csv file.

'''Print''' statement prints the names from the csv file.
|-
| style="border:1pt solid #000000;padding:0.097cm;"| Press''' Ctrl+S'''
| style="border:1pt solid #000000;padding:0.097cm;"| Now, press''' Ctrl+S''' to save the file.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Let us execute the program.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| In terminal >> type''' perl csvtest.pl''' and press''' Enter'''.
| style="border:1pt solid #000000;padding:0.097cm;"| Switch back to the''' terminal''' and type

'''perl csvtest.pl'''
and press''' Enter'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| '''Highlight the output'''
| style="border:1pt solid #000000;padding:0.097cm;"| Here we can see names field as output.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Next, let us see how to download required''' CPAN''' modules in''' Windows OS.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 6:

'''Perl Installation on Windows OS'''

| style="border:1pt solid #000000;padding:0.097cm;"| When '''Perl '''is installed, a utility called''' PPM (Perl Package Module)''' get installed automatically.

To use '''PPM''', your computer must be connected to the internet.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 7:

'''Usage''':
PPM can be used to

* search module
* install
* remove and
* upgrade

| style="border:1pt solid #000000;padding:0.097cm;"| This utility can be used to

* search module
* install
* remove and
* upgrade

required '''modules '''on '''Windows OS'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Now let us open the command window in '''Windows OS'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| To open the '''command window''', click on '''Start '''and type '''cmd '''and press '''Enter.'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| In the command window, type
> perl -v
| style="border:1pt solid #000000;padding:0.097cm;"| Type '''perl hyphen v '''

to''' '''check whether '''Perl''' is installed on your '''Windows OS machine'''.

You will see the '''Perl '''version number that is installed on your machine.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 7:

Perl Installation on Windows OS.

| style="border:1pt solid #000000;padding:0.097cm;"| If '''Perl''' is not installed, refer to the '''Perl '''installation tutorial on this website.

It will tell you how to install '''Perl '''on '''Windows OS'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| '''Start → Run → type in cmd'''
| style="border:1pt solid #000000;padding:0.097cm;"| At the''' “DOS” prompt,''' type

'''ppm install Text::CSV''' and press '''Enter.'''

Please note, '''module''' names are case sensitive.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| We can see the installation process has begun.

Wait until the installation gets completed.
|-
| style="border:1pt solid #000000;padding:0.097cm;"| Visual Cue

In the Command window,

C:/Documents >
| style="border:1pt solid #000000;padding:0.097cm;"| I have copied the '''candidates.csv''' and '''csvtest.pl''' file to the present working directory.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| Let us execute the '''Perl '''program now.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| In command window >> type''' perl csvtest.pl''' and press''' Enter'''.
| style="border:1pt solid #000000;padding:0.097cm;"| In the '''command window''' type

'''perl csvtest.pl'''

and press''' Enter'''.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| '''Highlight the output'''
| style="border:1pt solid #000000;padding:0.097cm;"| Here is the output.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| This brings us to the end of this tutorial. Let us summarise.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 7:

'''Summary'''
| style="border:1pt solid #000000;padding:0.097cm;"| In this tutorial we learnt about how to download required CPAN modules in

* '''Linux''' and
* '''Windows'''

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 8:

'''Assignment'''

| style="border:1pt solid #000000;padding:0.097cm;"| Here is an assignment for you.

# Try to install''' Date::Calc''' module.
# Make use of the given website for module search:

[http://www.cpan.org/modules/ http://www.cpan.org/modules/]

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 9:

About Spoken Tutorial project

| style="border:1pt solid #000000;padding:0.097cm;"| The video at the following link summarises the Spoken Tutorial project.

Please download and watch it

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 10:

Spoken Tutorial workshops

| style="border:1pt solid #000000;padding:0.097cm;"| The''' Spoken Tutorial Project''' Team

* conducts workshops using spoken tutorials and
* gives certificates on passing online tests.

For more details, please write to us.

|-
| style="border:1pt solid #000000;padding:0.097cm;"| Slide 11:

| style="border:1pt solid #000000;padding:0.097cm;"| Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at
this link.

|-
| style="border:1pt solid #000000;padding:0.097cm;"|
| style="border:1pt solid #000000;padding:0.097cm;"| This is Nirmala Venkat from IIT Bombay, signing off. Thanks for watching.

|}

PERL/C3/Downloading-CPAN-module/English - Revision history

Nirmala Venkat: Created page with "'''>>Title of script''':''' Downloading CPAN modules''' '''Author: Nirmala Venkat''' '''Keywords: Perl Module Library (CPAN), cpan modules on linux, cpan modules on windows,..."