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Changes
→Tutorial Reference Material
* [https://en.wikipedia.org/wiki/Control_flow Purpose]
* [https://www.computerhope.com/unix/test.htm test command]
* [https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php#:~:text=If%20statements%20(and%2C%20closely%20related,conditions%20that%20we%20may%20set. if statement]
* for loop