taking command line switches.

https://www.perlmonks.org/?node_id=886569


perl script to handling multiple selections form

https://stackoverflow.com/questions/1781452/how-do-i-handle-a-multiple-select-form-field-in-perl

https://stackoverflow.com/questions/34425811/perl-how-to-handle-multiple-check-boxes



https://www.perlmonks.org/?node_id=640119

https://www.w3schools.io/languages/perl-switch/