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CHAPTER 2 GETTING STARTED
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Figure 2-5. Ruby installer
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When the installer is finished, you can test to see if Ruby is working and that your environment is correctly configured by opening your command prompt and asking Ruby its version number.
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> ruby --version
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ruby 1.8.5 (2006-08-25) [i386-mswin32]
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Installing Rails
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You ll be pleased to know that the one-click installer also installed RubyGems, a package management system for Ruby (http://rubyforge.org/project/rubygems), which makes installing Ruby libraries, utilities, and programs a breeze. This includes Rails installation.
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CHAPTER 2 GETTING STARTED
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To install Rails using RubyGems, open your command prompt and issue the gem command, as follows.
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> gem install rails --include-dependencies
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Be forewarned that the gem command can take some time, so don t be discouraged if it seems to be sitting there doing nothing for a few minutes; it s probably just updating its index file. It s worth pointing out that RubyGems searches for gems in its remote repository (http://gems.rubyforge.org), so you need to be connected to the Internet for this command to work. Also, if you have a firewall or other network settings that restrict communication with the Internet, you might have problems. For more information and troubleshooting tips, see the RubyGems project page at http://rubyforge.org/project/ rubygems. After spitting out some text to the screen and generally chugging away for a few minutes, the gem program should exit with something like the following before dumping you back at the command prompt.
Successfully installed rails-1.2.3
That s all there is to it! The one-click installer took care of most of the work by installing and configuring Ruby, and since Rails is distributed as a RubyGem, installing it was a simple one-liner! You can double-check that Rails was installed successfully by issuing the rails --version command at the command prompt.
> rails --version
> Rails 1.2.3
With Ruby and Rails happily installed, it s time to take it for a test drive. Unless you feel like reading the installation instructions for Linux, you re free to skip ahead to the Creating Your First Rails Application section.
Installing on Linux
Linux, and UNIX-based systems in general, come in a variety of different flavors, but all share a lot in common. For these instructions, we re using a Debian-based variant called Ubuntu Linux (specifically, Dapper Drake), but they should apply to most UNIX systems
CHAPTER 2 GETTING STARTED
with varying mileage. Check out the latest information on the Rails wiki (http://wiki. rubyonrails.org/) for help with specific problems.
Note Ubuntu Linux is a top-notch distribution that s rapidly gaining mindshare in the Linux community.
At the time of this writing, it is poised to become the most popular Linux distribution for general use and is largely responsible for the increased viability of Linux as a desktop platform. It s freely available from http://unbuntu.org and highly recommended. Keir Thomas has written an excellent book titled Beginning Ubuntu Linux (Apress, 2007). If you re new to Ubuntu (or to Linux in general), you might want to check it out.
Just about all Linux distributions (including Ubuntu) ship with a package manager. Whether you are installing programs or code libraries, they usually have dependencies, and a single program could depend on dozens of other programs in order to run properly, which can be a struggle to deal with yourself. A package manager takes care of these tasks for you, so you can focus on better things. Ubuntu Linux includes the Debian package manager apt, which is what we ll be using in our examples. If you re using a different distribution, you ll likely have a different package manager, but the steps should be reasonably similar. If you re looking for a more do-it-yourself method, you can refer to the OS X installation instructions earlier in this chapter, which describe the process of building and installing the necessary packages yourself. Before you begin installing MySQL, Ruby, RubyGems, and Rails, update the package library using apt-get update.
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