Updated tutorial.md to add more Linux details

Updated tutorial.md to add more details about how to install the required software on various Linux distros.

Author: JavaDevVictoria

general/setup/tutorial.md

@@ -20,16 +20,16 @@ Programmers use **text editors** to write code. You could use [Notepad](https://
 - **Project navigation and tabs** help you move between the different files in your project.
 - **Autocompletion** shows you keywords you could use to finish what you're typing, so you don't have to remember all the possible commands.
 
-We recommend you use **[Atom](https://atom.io/)** at Codebar. It's free, open source, and runs on Windows, Mac, and Linux. **[Sublime Text 2](http://www.sublimetext.com/)** is another popular choice. It's free to download & use for as long as you like (though it will nag you intermittently to buy it when you save your work), and it runs on both Windows & Mac.
+We recommend you use **[Atom](https://atom.io/)** at Codebar. It's free, open source, and runs on Windows, Mac, and Linux. **[Sublime Text 2](http://www.sublimetext.com/)** is another popular choice. It's free to download & use for as long as you like (though it will nag you intermittently to buy it when you save your work), and it runs on Windows, Mac and Linux.
 
 
 ## A web browser (required)
 
-You'll have one of these already! Windows comes with [Internet Explorer](http://windows.microsoft.com/en-us/internet-explorer/), and OS X comes with [Safari](https://www.apple.com/uk/safari/). [Firefox](https://www.mozilla.org/en-US/firefox/) and [Chrome](https://www.google.com/chrome/) are popular alternatives. You can get started with whatever you currently use, but when you reach the later tutorials the powerful developer tools in Chrome and Firefox will be useful. Your coach will show you how to use them while you work through the tutorials.
+You'll have one of these already! Windows comes with [Internet Explorer](http://windows.microsoft.com/en-us/internet-explorer/), and OS X comes with [Safari](https://www.apple.com/uk/safari/). Most Linux distributions come with Firefox [Firefox](https://www.mozilla.org/en-US/firefox/), which is also available for Windows and OS X. You can also download [Chrome](https://www.google.com/chrome/) which is a popular alternative. You can get started with whatever you currently use, but when you reach the later tutorials the powerful developer tools in Chrome and Firefox will be useful. Your coach will show you how to use them while you work through the tutorials.
 
 ## A compression utility (handy on Windows)
 
-Many of the tutorials have links to download code from Gist in .tar.gz format. Macs have built-in support to extract the files from these archives for you. On Windows there are a variety of utilities available. If you don't already have one, [7-zip is free](http://www.7-zip.org/).
+Many of the tutorials have links to download code from Gist in .tar.gz format. Macs and most Linux distributions have built-in support to extract the files from these archives for you. On Windows there are a variety of utilities available. If you don't already have one, [7-zip is free](http://www.7-zip.org/).
 
 ## Ruby (optional)
 
@@ -39,5 +39,30 @@ If you have a Mac you'll have a version of Ruby installed already. A coach can h
 
 You can [download and run the RubyInstaller program](http://rubyinstaller.org/) to program Ruby on Windows.
 
+On Linux, you can install Ruby using your distribution's package manager, as follows:
+
+Debian GNU/Linux and Ubuntu use the apt package manager:
+
+```bash
+$ sudo apt-get install ruby-full
+```
+
+CentOS, Fedora, and RHEL use the yum package manager:
+
+```bash
+$ sudo yum install ruby
+```
+
+Gentoo uses the portage package manager:
+
+```bash
+$ sudo emerge dev-lang/ruby
+```
+
+Arch Linux uses a package manager named pacman. To get Ruby, just do this:
+
+```bash
+$ sudo pacman -S ruby
+```