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Typically, when you install Ruby onto your computer, you ll get the Ruby interpreter, the program that understands other programs written in the Ruby language, along with a collection of extensions and libraries to make your Ruby more fully featured. However, some installers, such as the Windows installer covered in the following section, include source code editors and more easily accessible documentation, whereas other implementations might not. Fortunately, any extras included by one distribution and not another are always available separately to install later. To satisfy the majority of readers without referring to external documentation, I m providing full instructions for using Ruby on Windows, Mac OS X, and Linux, along with links to Ruby implementations for other platforms. In each case, I provide instructions to check that the installation is successful before sending you on to the programming fun in 2.
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n Note Ruby comes in multiple versions, such as 1.8.7 and 1.9.1. The code in this book is primarily aimed
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at 1.8.7, but will work in 1.9.1, too. There are differences between the 1.8.* and 1.9.* versions that can become important when you reach more advanced topics, but at this stage you can choose whichever is easiest to install on your platform. Or, if Ruby is already installed on your machine, simply use that as-is.
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Ruby was initially designed for use under UNIX and UNIX-related operating systems such as Linux, but Windows users have access to an excellent one-click installer, which installs Ruby, a horde of extensions, a source code editor, and various documentation, in one click. Ruby on Windows is as reliable and useful as it is on other operating systems, and Windows makes a good environment for developing Ruby programs. To get up and running as quickly as possible, follow these steps: 1. Open a web browser and go to http://www.ruby-lang.org/en/downloads/. 2. Scroll down to the Ruby on Windows section, about halfway down the page. 3. In the Ruby on Windows section, you ll see a few links for different versions of Ruby you can download for Windows. Ideally, you want to download the file at the link that s highest in the list that s referred to as a One-Click Installer. At the time of writing, this is version 1.8.6 (though it may be 1.9.1 or higher when you read this). 4. Click the link from step 3 and run the downloaded file to launch the installer. The file is approximately 20 MB in size, so it may take a while to download. 5. If Windows gives you a Security Error box, click the Run button to give your approval. 6. A typical installation program appears with some instructions. On the initial screen, click Next.
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7. Work your way through the installation screens. Leave the boxes checked to install the text editor SciTE and the Ruby package manager RubyGems (more on that in C hapter 7). Unless you have a specific reason not to, let the installation program install Ruby in its default location of c:\ruby and its default program group. 8. Installation takes place when you see a stream of filenames flying up your screen. Wait several minutes for the installation process to complete, and enjoy the view. There are a lot of files to install! 9. Installation is complete when the installation program says Installation Complete and the Next button is clickable. Click the Next button, and then click Finish to exit the installation program. If Ruby installed correctly, congratulations! Go to the Start menu and then the rograms or All Programs menu. There should be a Ruby program group that contains P icons for SciTE, an uninstaller, and other bits and pieces. To test that your Ruby installation works correctly for 2, you need to load the program listed as fxri Interactive Ruby Help & Console, so click this entry and wait for the program to load. If the program loads successfully, you ll see a screen that looks somewhat like Figure 1-1.
Figure 1-1. The fxri interactive Ruby program If fxri started properly, then Ruby is installed correctly. Congratulations! Lastly, you need to be familiar with running Ruby and its associated utilities from the command prompt, so go to Start Run, type cmd into the box, and click OK ( Command Prompt might also be
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