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On Linux, this is the X11 primary selection, not the clipboard.

It's a clipboard. I use mostly that one. It works everywhere.

You're both correct. Yes, it acts as a clipboard, for all practical purposes. But also it's a terminology thing.

If you'd open ICCCM, it uses name "CLIPBOARD" for a different selection atom: https://www.x.org/releases/X11R7.6/doc/xorg-docs/specs/ICCCM... So in X11 the term "clipboard" (in a technical, not colloquial sense) is reserved for a different selection. And thus primary selection is not a clipboard.

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