Appendix A. Installing Sass and Compass
Both Sass and Compass are command-line tools built on top of the Ruby programming language. To use them you’ll need to have Ruby installed as well as a basic understanding of your computer’s command line. Sass and Compass can be installed on Windows, Mac OS X, and Linux.
A.1. Installation on Windows
Windows doesn’t come with Ruby, so unless you have previously installed it, you’ll need to do so now. It only takes a few minutes.
A.1.1. Opening the Windows command prompt
On Windows 7, you can launch the command prompt from the Windows start menu by selecting All Programs > Accessories > Command Prompt. Alternately, you can type command into the search box and then select Command Prompt from the results. ...