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If you re using the SciTE or FreeRIDE programs that came with the Ruby installer for Windows, you can run Ruby programs directly from them (see Figure 4-2). In both programs you can press the F5 function key to run your Ruby code. Alternatively you can use the menus ( Tools Go in SciTe, and Run Run in FreeRIDE). However, before you do this, it s important to make sure you have saved your Ruby code. If not, the results might be unpredictable (running old code from a prior save, for example) or you ll be prompted to save your work. If running the a.rb code gives a satisfactory output in the output view pane (to the right on SciTE, and at the bottom on FreeRIDE), you re ready to move on to the section, Our Application: A Text Analyzer.

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Figure 4-2. Running code in FreeRIDE on Microsoft Windows (notice the output in the bottom pane)

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Alternatively, you might prefer to run Ruby from the command prompt. To do this, load up the command prompt ( Start menu Run Type cmd and click OK ), navigate to the folder containing a.rb using the cd command, and then type ruby a.rb.

However, this method is only advised if you understand how to navigate your hard drive from the command prompt. Another option, if you re comfortable with creating shortcuts, is to create a shortcut to the Ruby executable file (ruby.exe) and drop your source code file(s) onto it.

4. Unpack the archive with the command tar -xzvf Python-2.4.tgz (where 2.4 is the version number of the downloaded source code). If your version of tar doesn t support the z option, you may want to uncompress the archive with gunzip first, and then use tar -xvf afterward. If there is something wrong with the archive, try downloading it again. Sometimes errors occur during download. 5. Enter the unpacked directory: $ cd Python-2.4 Now you should be able to execute the following commands: ./configure --prefix=$(pwd) make make install You should end up with an executable file called python in the current directory. (If this doesn t work, please consult the README file included in the distribution.) Put the current directory in your PATH environment variable, and you re ready to rock. To find out about the other configuration directives, execute ./configure --help

The simplest method to run Ruby applications on Mac OS X is from the Terminal, much in the same way as irb is run. The Terminal was explained in 1. If you followed the preceding instructions, continue like so: 1. Launch the Terminal (found in Applications/Utilities). 2. Use cd to navigate to the folder where you placed a.rb like so: cd ~/ruby . This tells the Terminal to take you to the ruby folder located off of your home user folder. 3. Type ruby a.rb and press Enter to execute the a.rb Ruby script. 4. If you get an error such as ruby: No such file or directory -- a.rb (LoadError), you aren t in the same folder as the a.rb source file and need to establish where you have saved it. If you get a satisfactory response from a.rb, you re ready to move on to the section, Our Application: A Text Analyzer.

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In Linux or other Unix-based systems, you run your Ruby applications from the shell (that is, within a terminal window) in the same way that you ran irb. The process to run irb was explained in 1, so if you ve forgotten how to get that far, you need to recap yourself before continuing like so: 1. Launch your terminal emulator (xterm, for example) so you get a Linux shell/command prompt. 2. Navigate to the directory where you placed a.rb using the cd command (for example, cd ~/ruby takes you to the ruby directory located directly under your home directory, usually /home/yourusernamehere/). 3. Type ruby a.rb and press Enter to make Ruby execute the a.rb script. If you get a satisfactory response from a.rb, you re ready to move on.