In this video I demonstrate how to setup Terminal user interfaces (TUI) using the Linux dialog utility and then explained how that bastion server script works. Keep in mind that the script is intended for demonstration purposes only and does contain loopholes; if you intend to use it in a real environment, you must harden the script. Chapters: 00:00 Intro 00:28 Dialog vs Whiptail 01:10 Starting 01:56 Message box 03:34 Yes/No choice 05:30 Input box 07:32 Password box 08:54 Multi-choice menu 10:36 Bastion server script explained