Wayland is a new display manager that's about to ship as a default option in the upcoming Red Hat 8, and will be seeing increasing adoption on additional distros as well.
Best resource I've found with resources for talking to the Wayland clipboard is this stackoverflow.
(Alas at the current time Wayland is a pretentious gasbag that declares only input events are supposed to be able to write to the clipboard, but it appears to be up to the compositor/desktop-env to enforce this. Grah.)
sindresorhus / clipboardy
Access the system clipboard (copy/paste)
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