Ruby/C2/Hello-Ruby/English

Title of script: Hello Ruby!

Author:Afrin Pinjari

Keywords: Ruby,video tutorial, helloworld, puts, print

Visual Cue	Narration
Slide 1	Welcome to the Spoken Tutorial on Hello Ruby!
Slide 2 Learning Objectives	In this tutorial we will learn What is Ruby? Features RubyGems & Help on Ruby Installation Running Ruby code Commenting Difference between puts and print
Slide 3 System Requirements	Here we are using Ubuntu Linux version 12.04 Ruby 1.9.3
Slide 4 Pre-requisites	To follow this tutorial you must be connected to the internet. You must have knowledge of using Terminal and Text editor in Linux.
Slide 5 What is Ruby?	Now I will explain what is Ruby. Ruby is an object-oriented, interpreted scripting language. It is dynamic, open source programming language. It has an elegant syntax that is natural to read and easy to write.
Slide 6 Features	Now let us see some features of Ruby. Ruby is highly portable. Ruby program runs in any operating system. Variables in Ruby have no datatype, such as in Smalltalk, BASIC or Python. It supports automatic memory management. Ruby is free format language. You can start writing your program from any line and column. Ruby is used for developing Internet and Intra-net applications.
Slide 7 RubyGems	One of the most important feature of Ruby is RubyGems. RubyGems is a package manager for the Ruby programming language. It provides a standard format for distributing Ruby programs and libraries. You can create and publish your own gems. For more information on RubyGems visit the following link.
Slide 8 Help on Ruby	To get more help on Ruby you can visit the links shown.
Slide 9 Installation	You can install Ruby using the Ubuntu Software Centre. For more information on Ubuntu Software Centre, please refer to the Ubuntu Linux Tutorials on this website.
Slide 10	Other methods for installing Ruby are as shown in this slide.
Slide 11 Running Ruby	Ruby code can be executed in 3 ways Command line Interactive Ruby As a file We will go through each method of execution.
	First let us see how to execute 'Hello World' code from the command line.
Switch to Terminal Press Ctrl+Alt+t	Open a terminal by pressing the Ctrl, Alt and T keys simultaneously. A terminal window appears on your screen.
Type ruby -e 'puts ”Hello World”'<<press Enter	Type the command ruby space hyphen e space within single quotes puts space then within double quotes Hello World and Press Enter.
Highlight Hello world	We get the output as Hello World.
Highlight puts	puts command is used to print the output on the terminal.
Highlight -e	The hyphen e flag allows only a single line of code to be executed. Multiple hyphen e flags can be used to execute multiple line commands. Lets try this out
Press Up Arrow key	Now press the up Arrow key to get the previous command and
Type ruby -e 'puts “Hello World”' -e 'puts 1+2'<< Press Enter	Type space hypen e space within single quotes puts space 1+2 and Press Enter.
Highlight Hello World and 3	We get the output as Hello World and 3. Let's switch back to our slide
Slide 11 Interactive Ruby	We will now learn about Interactive Ruby. Interactive Ruby allows the execution of Ruby commands with immediate response. You can run Ruby statements and examine the output and return values. For older version of Ruby, install irb separately.
Switch to the Terminal Type irb<< press Enter	Now let us execute our Ruby code through irb. Go to the terminal. Type irb and press Enter to launch Interactive Ruby.
Type puts ”Hello World” <<Press Enter	Type puts space within double quotes Hello World and press Enter.
Highlight Hello World and nil	We get the output as Hello World. And we get the return value as nil.
Type exit <<Press Enter	To exit from irb type exit and press Enter.
	You can also run Ruby program from a file. You can use any text editor of your choice to write the code.
Switch to text editor	I am using gedit text editor. Let me switch to gedit text editor.
Type puts ”Hello World ”	Now, type puts space within double quotes Hello World
	Lets learn how to add multiple line or block comments.
Type =begin <<press Enter	Before the puts command Type, equal to begin and press Enter
Highlight =begin	Equal to begin is used to start the comment.
Type My first Ruby program This code will print Hello world Press Enter	Type the comments that you wish to add. I will type My first Ruby program. Press enter This code will print Hello world. Press Enter
Type =end	Now type equal to end
Highlight =end	equal to end is used to end multiple line comments.
	Comments are useful to understand the flow of program. It is useful for documentation.
Click on the Save button	Now, let us save the file by clicking on the Save button. It is a good practice to save the file frequently.
In the Save As dialog box >> Browse the location to save the file	The Save As dialog box appears on your screen. Browse the location where you want to save the file.
Create a folder named rubyprogram on the Desktop.	On Desktop, I will create a folder named rubyprogram. We will save the file inside this folder.
In Name text-box >> type hello.rb	In the Name text-box, type the name that you wish to add. I will type hello.rb
Point to Dot rb extension	Dot rb extension is given to a Ruby file
Click on Save button	Then click on Save button to save the file. So the file is saved now.
Switch to the terminal.	To execute the code, go to the terminal. Lets clear the terminal first.
	Make sure that you are in the directory where your Ruby file is present.
	Remember that we are in the home directory. We need to go to the subdirectory rubyprogram.
Type cd Desktop/rubyprogram<< Press Enter	To do so, type cd space Desktop/rubyprogram and press Enter.
Type ruby hello.rb <<Press Enter	Let's execute the file Type ruby space hello dot rb and press Enter
Highlight HelloWorld	We get the output HelloWorld.
	Now let me demonstrate the difference between puts and print statement. We will try this out using irb
Type cd <<press Enter	Before that we need to go back to the home directory To do so type cd and press Enter
In the terminal Type irb<< press Enter	Now type irb and Press Enter to launch the Interactive Ruby.
Type puts “Hello”,”World”	Type puts space within double quotes Hello comma within double quotes World
Highlight or point to comma Press Enter	Here comma is used to join the two puts command together. Now press Enter.
Highlight Hello World	We get the output Hello World, but on separate lines.
Type print “Hello”,”World” <<Press Enter	Now let's try the same thing with print. Press up arrow key to get the previous command Replace puts with print and Press Enter.
Highlight HelloWorld	We get the output as Hello World but on the same line.
	The keyword puts adds a newline to the end of the output. The keyword print does not.
	The keyword print outputs only what we have provided.
	<<Pause>> This brings us to the end of this Spoken Tutorial.
Slide 11 Summary	In this tutorial we have learnt About Ruby Installation Execution of Ruby code Adding multiple comments =begin ...... =end Difference between puts and print
Slide 13 Assignment	As an assignment Write a program to print your name and age We used multiple line comments in this tutorial Try to give single line comment Hint: #...............
Slide 14 About the Spoken Tutorial Project	Watch the video available at the following link. It summarises the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it.
Slide 15	The Spoken Tutorial Project Team : Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide 16 Acknowledgement	Spoken Tutorial Project is a part of the Talk to a Teacher project. It is supported by the National Mission on Education through ICT, MHRD, Government of India. More information on this Mission is available at below link: spoken-tutorial.org/NMEICT-Intro.
NO SLIDE On the previous slide itself.	This is Afrin Pinjari from IIT Bombay, signing off. Thank you for watching.

Contributors and Content Editors

Afrin, Nancyvarkey, Sneha