User forbade pointed out this great guide from the Linux Documentation Project:
Advanced BASH scripting (pdf)
It is also available in other formats.
Speaking of BASH scripting, my favorite BASH book is published by O'Reilly, Learning the BASH shell. It covers a lot of basics and command line use in addition to programming.
Also, when I am writing a serious production script, I often start with new_script, a shell script that creates a solid template as a starting point. You can download new_script from the LinuxCommand.org script library.
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CommandLineMac
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