PERL/C3/Downloading-CPAN-module/English-timed
From Script | Spoken-Tutorial
Revision as of 16:59, 12 July 2016 by PoojaMoolya (Talk | contribs)
| Time | Narration |
| 00:01 | Welcome to the Spoken Tutorial on Downloading CPAN modules. |
| 00:06 | In this tutorial we will learn how to download required CPAN modules in
|
| 00:17 | To record this tutorial, I am using
|
| 00:32 | You can use any text editor of your choice. |
| 00:36 | To follow this tutorial, you should have working knowledge of Perl programming. |
| 00:41 | If not, then go through the relevant Perl spoken tutorials on the spoken tutorial website. |
| 00:48 | First we will learn how to download CPAN modules in Ubuntu Linux OS. |
| 00:55 | Switch to the terminal. |
| 00:57 | Type sudo space cpan and press Enter. Enter the password if required. |
| 01:06 | If cpan is not installed in your system, it will prompt you for the installation process.
|
| 01:13 | Please proceed with the steps. Your computer must be connected to the internet for the installation process. |
| 01:21 | We can see the prompt changes to cpan. |
| 01:26 | Say for example, I want to extract some data from a CSV file and use in my Perl program. |
| 01:35 | For this, we will use Text colon colon CSV module. |
| 01:40 | Before using, we have to install the Text colon colon CSV module |
| 01:46 | Switch to the terminal. |
| 01:48 | Type Install Text colon colon CSV and press Enter. |
| 01:55 | We can see the installation of corresponding packages of this module. |
| 02:00 | Installation will take sometime to complete depending upon your internet speed. |
| 02:06 | Now let us check whether the module is installed successfully or not. |
| 02:12 | Hit the 'q' key to exit cpan. |
| 02:16 | Type instmodsh and press Enter. |
| 02:23 | Type l to list all installed modules. |
| 02:28 | Here we can see Text colon colon CSV, which shows that the modules is installed in our system. |
| 02:38 | Type 'q' to exit. |
| 02:41 | Now I will open the candidates.csv which i have already saved. |
| 02:47 | Type gedit candidates.csv and press Enter. |
| 02:53 | Here we can see name, age, gender and email details of the candidates with a comma separator. |
| 03:02 | Now I will open csvtest.pl file in which I have written a Perl program that uses this module. |
| 03:11 | This program will extract the name field values which are stored in the csv file. |
| 03:18 | use statement loads the Text colon colon CSV module. |
| 03:23 | I have declared the candidates.csv file to a local variable dollar file. |
| 03:29 | The next statement will open the file in READ mode. |
| 03:34 | Text colon colon CSV is the class and we can create an instance, by calling the constructor with new. |
| 03:42 | This line creates an object setting the separator character to be comma (,). |
| 03:48 | Here, while loop fetches the data line by line using the getline method. |
| 03:54 | getline method returns a reference to an array. |
| 03:58 | We need to dereference it, to fetch the value. |
| 04:02 | Index of zero represents the name field in the csv file. |
| 04:07 | Print statement prints the names from the csv file. |
| 04:11 | Now, press Ctrl+S to save the file. |
| 04:15 | Let us execute the program. |
| 04:18 | Switch back to the terminal and type perl csvtest.pl and press Enter. |
| 04:27 | Here we can see names field as output. |
| 04:32 | Next, let us see how to download required CPAN modules in Windows Operating System. |
| 04:39 | When Perl is installed, a utility called PPM ie. Perl Package Module get installed automatically. |
| 04:48 | To use PPM, your computer must be connected to the internet. |
| 04:53 | This utility can be used to
required modules on Windows Operating System. |
| 05:04 | Now let us open the command window in Windows OS. |
| 05:09 | To open the command window, click on Start and type cmd and press Enter. |
| 05:17 | Type perl hyphen v to check whether Perl is installed on your Windows OS machine. |
| 05:25 | You will see the Perl version number that is installed on your machine. |
| 05:30 | If Perl is not installed, refer to the Perl installation tutorial on this website. |
| 05:36 | It will tell you how to install Perl on Windows OS. |
| 05:41 | At the “DOS” prompt, type ppm install Text colon colon CSV and press Enter. |
| 05:49 | Please note, module names are case sensitive. |
| 05:53 | We can see the installation process has begun. Wait until the installation gets completed. |
| 06:00 | I have copied the candidates.csv and csvtest.pl file to the present working directory. |
| 06:08 | Let us execute the Perl program now. |
| 06:11 | In the command window type perl csvtest.pl and press Enter. |
| 06:18 | Here is the output. |
| 06:21 | This brings us to the end of this tutorial. Let us summarise. |
| 06:26 | In this tutorial we learnt about how to download required CPAN modules in
|
| 06:34 | Here is an assignment for you.
|
| 06:47 | The video at the following link summarises the Spoken Tutorial project. Please download and watch it |
| 06:54 | The Spoken Tutorial Project Team
|
| 07:03 | For more details, please write to us. |
| 07:06 | Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.
More information on this mission is available at this link. |
| 07:18 | This is Nirmala Venkat from IIT Bombay, signing off. Thanks for watching. |
