Bash Script Check If Variable Is Not Null

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jQuery : How to check if a variable is null or empty string or all whitespace in JavaScript ...
jQuery : How to check if a variable is null or empty string or all whitespace in JavaScript ...

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What is $0 in a Bash Script?
What is $0 in a Bash Script?

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What is $0 in a Bash Script?
What is $0 in a Bash Script?
Check if Variable is Empty in Bash
Check if Variable is Empty in Bash

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