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n On some systems, irb might have a slightly different name. For example, on Ubuntu it can be named Tip irb1.8 (or irb1.9), and you ll need to run it as such. The Ruby interpreter s executable may also be named ruby1.8 (or ruby1.9). Make sure to try all of these possibilities before continuing. You might also try using your shell s tab completion feature by typing ruby and pressing Tab to see if there are any alternatives available.

Once you ve run irb, you should get the following output: irb(main):001:0> If running irb results in a similar output, you can move on to 2. (You might wish to type exit and press Enter to get back to the command line!) Otherwise, read on to install a fresh version of Ruby.

{1,2,3,1}

The installation procedure for Ruby on Linux varies between different Linux distributions. Some distributions, such as Gentoo, Debian, and Red Hat, provide package managers to make installation of programs easy. Others require that you install directly from source or install a package manager beforehand. If you re comfortable with using emerge, rpm, or apt-get, you can install Ruby quickly with the following methods: Yum (on RedHat, CentOS, and Fedora): Install as follows: yum install -y ruby and then yum install -y ruby-devel ruby-docs ruby-ri ruby-irb ruby-rdoc. Gentoo: Use emerge as follows: emerge ruby. Debian and Ubuntu: Use apt-get, as such: sudo apt-get install ruby1.8 ruby1.8-dev ri1.8 rdoc1.8 irb1.8 libreadline-ruby1.8.

<Grid x:Name="LayoutRoot" Background="White"> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <Button Width="100" Height="30" Content="Button 1" Margin="5"></Button> <Button Width="100" Height="30" Content="Button 2" Margin="5"></Button> <Button Width="100" Height="30" Content="Button 3" Margin="5"></Button> </StackPanel> </Grid>

If one of these methods works for you, try to run Ruby and irb as shown in the preceding section, and progress to 2 if you re ready. Alternatively, you can search your distribution s package repository for Ruby, as the name for the Ruby package in your distribution might be nonstandard or changing over time. However, if all else fails, you can install Ruby directly from its source code in the next section.

The second line of this code reads the first line of text from the file, meaning the file pointer is waiting at the start of the second line of data. However, the following f.puts statement then puts a new line of text into the file at that position. Unfortunately, this action will not push the previously existing second line to the third line of the file. All it does is overwrite the equivalent number of bytes, so you end up with a broken third line! This behavior means you really need to think carefully before writing data into the middle of an existing file, as you may not get the outcome you thought you would! Whereas puts outputs lines of text, you can perform the writing equivalents of getc and read with putc and write: f = File.open("text.txt", "r+") f.putc "X" f.close This example opens text.txt for reading and writing, and changes the first character of the first line to X. Similarly: f = File.open("text.txt", "r+") f.write "123456" f.close This example overwrites the first six characters of the first line with 123456.

note It s worth noticing that putc and write overwrite existing content in the file rather than inserting it.

After you have made these changes, your buttons are spaced out nicely in the center of the application, as shown in Figure 3-10.

Character Sets and encodings (ruby 1.9 and above Only)

// { } is the empty collection > {1, 2, 3} {2, 3, 4, 5} {2, 3} {3, 4, 2} {4, 5, 6, 7}

Ruby 1.9 comes with built-in support for automatically handling alternative character encodings when reading files. Character encodings are explained and covered in depth in 11 s Unicode, Character Encodings, and UTF-8 Support section.

note If you are not already familiar with character encodings or are using Ruby 1.8, this section will be of

Microsoft designed the control framework so that any object can be contained within another object. One way you can enhance your layout is by nesting a layout control within another layout control. In this example, you will nest a StackPanel control within another StackPanel control, but realize that you can nest any layout control within any other layout control to get the exact layout functionality you are seeking.