Lucid guide for beginners,
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This review is from: Unix Shell Programming (Hayden Books UNIX System Library) (Paperback)
I bought this years ago, learned loads from it and became a Unix SA. I'm now a developer but still use shell scripting now and again to achieve simple tasks quickly. This book teaches the reader how to understand what is happening on the unix command line. Using this knowledge you can combine unix's excellent stream based tools to perform complex tasks quickly.
I still recommend this book every time I meet someone who wants to learn how to write shell scripts. It would be the one and only book I put forward, and I cannot say that for other areas of computer science.