This is just a heads-up that my Shell Scripting Recipes book is due out in August 2011.
I hope to publish more details here as things progress; for now, it is well on the way, but it is not too late for readers to contact me (firstname.lastname@example.org) if there is anything that you see as vital for a Shell Scripting Recipes book which was maybe missing from some other book you saw.
Part I covers Language and Usage; all of the concepts of the Shell and how it works.
Part II is Recipes using System Tools. This covers the commands that are necessary for shell scripting, and includes quite a few surprising ways to use them.
Part III is Recipes using Shell Features. This is similar to Part II but it gives concrete uses for the theory presented in Part I.
Part IV is Recipes for Systems Administration. This provides (and explains) various recipes for real-world systems administration tasks of and beyond the ordinary.
I do intend to keep you appraised of progress; you can also follow my personal blog at http://steve-parker.org/urandom/ for more detailed updates. The RSS feed for that blog is http://steve-parker.org/urandom/rss.php.