Taken from https://www.cyberciti.biz/open-source/learning-bash-scripting-for-beginners/
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BASH Programming – Introduction HOW-TO : This tutorials intends to help you to start programming basic-intermediate shell scripts. It does not intend to be an advanced document.
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Advanced Bash-Scripting Guide : An in-depth exploration of the art of shell scripting. A must read to master bash shell scripting for all Unix users.
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Learn Bash In Y Minutes : A quick tour of bash programming language.
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BASH Frequently Asked Questions : Greg’s Wiki includes answers to many bash programming problems in Q & A format.