The following sites provide information on shell scripting.
It's amazing that with the growth of all the other scripting languages, a site like this could still exist. BatFiles is a Web site purely devoted to the DOS shell scripter. Here you will find tons of examples, tricks, FAQs, links, and downloads.
Site: http://www.bigfoot.com/~batfiles/
A simple site full of tips, tricks, and techniques. There's even a section purely devoted to NT shell scripting.
Site: http://www.calweb.com/~webspace/batch/
This site contains a comprehensive list of shell scripting commands and their usage.
Site: http://www.easydos.com/dosindex.html
http://www.alt.msdos.batch
http://www.alt.msdos.batch.nt