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Ruby Programming
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Running Ruby Under Windows

There are two executables provided with the cygwin32 Ruby distribution: ruby.exe and rubyw.exe.

ruby.exe is meant to be used at a command prompt (a DOS shell), just as in the Unix version. For applications that read and write to the standard input and output, this is fine. But that also means that anytime you run ruby.exe, you'll get a DOS shell even if you don't want one---Windows will create a new command prompt window and display it while Ruby is running. This might not be appropriate behavior if, for example, you double-click on a Ruby script that uses a graphical interface (such as Tk), or if you are running a Ruby script as a background task, or from inside another program.

In these cases, you'll want to use rubyw.exe. It is the same as ruby.exe except that it does not provide standard in, standard out, or standard error, and does not launch a DOS shell when run.

You can set a file association[Using View/Options/Filetypes from Explorer.] so that files with the extension ``.rb'' will automatically use rubyw.exe. By doing this, you can double-click on Ruby scripts and they will simply run without popping up a DOS shell.
Ruby Programming
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