Here are some excerpts from or references to book reviews of the bash Cookbook.
Slashdot
The reviewer says "...this book was refreshing in that it was properly organized, and surprisingly contemporary...". Read the entire review here.
Linux Format magazine
This is a screen snap of the review -- notice the score: 10 out of 10.

;login: the magazine of usenix.org
Here's a book review from ;login: The entire review is available here as a .pdf file.
Here's a brief quote or two:
Read the whole review...then read the bash Cookbook, too!
Amazon.com
Customer reviews at Amazon
A blogger likes the book:
(Jim Jones, Morlock HQ, August 15, 2008)
"The Bash Cookbook is a must own book for anyone that uses Unix and Linux for fun or profit. Bash is a powerful shell environment available in everything from Mac OS X to commercial Unix offerings like Solaris. Being comfortable and productive with this shell is going to make your life a [whole] lot easier. The Bash Cookbook serves as a digestible tutor to this powerful shell while maintaining a depth that makes it a valuable reference for solutions to many of the common problems that command line power users face."
"...this is a great bash scripting resource and should find a good home on any scripter's bookshelf. It provides enough instruction to help a new-ish user understand the deeper power of bash scripting while having enough breadth and depth to serve as an invaluable resource for the experienced scripting guru."
Read the entire review here: http://morlockhq.blogspot.com/2008/08/book-review-bash-cookbook.html
Python readers like bash Cookbook
Read the whole review at the Bay Area Python Interest Group website.