I see you have a good amount of time in this script. I do appreciate the efforts.

I just see that writing large scripts like this is a waste of time when we have cool tech like Ansible that could do this far easier. Plus Ansible is idempotence!

Scripts like this take time to create, debug and read to those that are seeing it the first time, or the 100th. This is one reason imho why Ansible (Puppet, Chef) were created. Yaml synax is easy, just need a good editor that shows the spaces. I use Atom and sometimes Notepad++

For example, here is a Nginx role with php that I randomly found: https://github.com/geerlingguy/ansible-role-nginx