I am looking for suggestions. I know how to use Unix. What flavors of Linux are close to Unix but still offer great functionality of support and productivity software? I am essentially looking for a flavor of Linux that has nearly identicle commands in the terminal. I love Ubuntu's UI and I enjoy the functionality as a whole, but I hate how they have different commands in the terminal for what I've known and learned for Unix. Does anybody here have any idea for a version I could run on my Linux box? I've used Kali, Ubuntu, Cent, Fedora, and Red Hat, but I really haven't used any of those versions in recent years. I could really use some suggestions. By the way, I'll probably use this as a VM before installing it, so no worries.