Reference
test comand
https://www.cyberciti.biz/tips/find-out-if-file-exists-with-conditional-expressions.html
Formating date command
https://www.cyberciti.biz/faq/linux-unix-formatting-dates-for-display/
https://www.cyberciti.biz/tips/find-out-if-file-exists-with-conditional-expressions.html
https://www.cyberciti.biz/faq/linux-unix-formatting-dates-for-display/