This text consists of 30 sessions that teach the core concepts of UNIX over a weekend. It focuses on the standard core UNIX OS and teaches the basics needed to perform system administration and programming in the UNIX environment. It focuses on the common aspects among the different flavours (or types) of UNIX, noting the important differences throughout. Topics covered include the many flavors of UNIX; manipulating files; writing shell scripts; batch editing and programming with awk; Perl programming; Apache Web Server; and Internet security. The features of a Weekend Crash Course are: each session takes 30 minutes to complete; four time-to-go icons (30 Min To Go, 20 Min To Go, 10 Min To Go, and Done!) gauge the reader's progress through any given session; Quiz Yourself questions (at the end of each session) and Part Review questions allow the reader to review what they have just learnedl; and skill assessment software on the CD-ROM helps readers gauge their skill level before and after reading this book. The CD-ROM contains skills assessment software based on the sessions in the book; UNIX tools; and sample scripts from the book.