Is is typically the case that there are system-wide in most popular GUIs, like GNOME and KDE. It's even the case in something like i3 or sway. In a GUI environm

Is is typically the case that there are system-wide in most popular GUIs, like GNOME and KDE. It's even the case in something like i3 or sway. In a GUI environment, you get GUI-wide shortcut keys. On the command-line, there is no GUI. Yet there are still a number of system-wide shortcuts, but things are a little different, because you are interacting with text. And often, you're only interacting with one program at a time. In most places, ^C, ^D, ^I, and ^Z work the same way. In Bash and other shells and programs that use readline, several Emacs-style shortcuts also work the same, notably ^A, ^E, and ^K. There are probably others, but you'll notice that few of them have anything to do with copy and paste, because that is often meaningless between programs without a GUI to show multiple programs at once, in which case the GUI, not the CLI, would implement something. There just aren't that many needs for more shortcuts when you have only one program in front of you.