http://tldp.org/LDP/abs/html/
That should cover everything you need for Bash and derivative shells. It's actually a textbook recommend for a course, available freely. There is a pdf version available for free. I've gotten through the first ten chappters, and it's very well written with tons of examples.
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"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity."
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