ShellCheck

[JamesOBenson]

We run our code through various tools, for shell, one of them is shellcheck. Your code is mostly clean, but I recommend a couple of small changes to help make it pass those verifications as well without impacting the performance or significant modifications. For example, in your post_pve_install.sh - there are only 2 issues:

Instead of:

RD=$(echo "\033[01;31m")
YW=$(echo "\033[33m")
GN=$(echo "\033[1;92m")
CL=$(echo "\033[m")

You can use:

RD=$(printf '\033[01;31m')
YW=$(printf '\033[33m')
GN=$(printf '\033[1;92m')
CL=$(printf '\033[m')

and likewise, instead of this:

echo -e "\nThis script will Perform Post Install Routines.\n"
while true; do
  read -p "Start the Proxmox VE Post Install Script (y/n)?" yn
  case $yn in
  [Yy]*) break ;;
  [Nn]*) clear; exit ;;
  *) echo "Please answer yes or no." ;;
  esac
done

use this:

echo -e "\nThis script will Perform Post Install Routines.\n"
while true; do
    echo "Start the Proxmox VE Post Install Script?"
    select yn in "Yes" "No"; do
        case $yn in
            Yes ) break ;;
            No ) clear; exit ;;
            *) echo "Please answer (1) Yes or (2) No." ;;
        esac
    done
done

[tteck]

No thanks