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String Operation in Bash Scripts: [Beginner's Guide]
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How to Find Length of String in Bash Script? - GeeksforGeeks
Bash Shell: Find Out If a Variable Is Set or Not - nixCraft
Bash variables - Things that you probably don't know about it | Unboxing the Cloud
regex - how to extract the string from two delimiter strings using sed or awk or bash? - Stack Overflow
Using variables in Bash | Opensource.com
How to Find Length of String: Bash Script Reference Guide
