The FreeBSD base system ships with two editors (IIRC): ed and nvi. Ed doesn’t let you copy and paste at all, except whole lines. I don’t know for sure, but I’d

The FreeBSD base system ships with two editors (IIRC): ed and nvi. Ed doesn’t let you copy and paste at all, except whole lines. I don’t know for sure, but I’d guess that nvi does work properly with Unicode. But can the base system’s font render it properly? I don’t know. Anyway, that’s beside the point. It’s an unnecessary piece of additional complexity for, as far as I can tell, no real benefit over escape sequences.