I have a page with a few links, most of which I like better than the ldp ones.
http://home.nyc.rr.com/computertaiju...scripting.html
As for books, the Sams Teach Yourself Shell Scripting in 24 hours is not bad as well as the Unix Shell Programming (3rd edition--the 4th edition is by someone else and apparently not as good). The 3rd edition is here
http://www.amazon.com/Unix-Shell-Pro...8713405&sr=8-3