Refrences

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https://linuxize.com/post/bash-if-else-statement/

https://bash.cyberciti.biz/guide/While_loop

https://linuxize.com/post/bash-until-loop/

https://devhints.io/bash

http://johnstowers.co.nz/pages/bash-cheat-sheet.html

https://github.com/LeCoupa/awesome-cheatsheets/blob/master/languages/bash.sh

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