A Quick Introduction to Unix - Wikibook Review
This book has 26 webpages as of 7/1/2012. All pages are listed below for ease of reference.
This wikibook was started more than a year ago. Revisions were last made more than a year ago. The last 50 revisions of the book's front page, not counting the most recent 8, were made between 9/21/2010 and 9/30/2010, spreading over 8 days.