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Calibre has been known to run on BSD, I'll leave to others as to whether it is real Unix.
The Ctrl+Z/X/C/V/Y text editing sequences (undo, cut, copy, paste, redo) originated at Xerox Parc Place in the early 1980s, maybe even the late 1970s.
I often find myself using the SAA/CUA editing sequences: Shift+Del, Ctrl+Ins, Shift+Ins for cut/copy/paste.
BR
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