Rectangles

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Rectangular commands means commands that can work on rectangular blocks of text, for example columns.

Editors that support this:

There are several kinds of operations you might do this:

MoveRectangle?
CopyRectangle?
CutRectangle?
FilterRectangle? (applying a function over every line in a rectangle -- like Unix filters/pipes).
InsertRectangle?
InsertAtRectangle
PasteRectangle?
MathRectangle (like adding up columns of numbers)
OverlayRectangle? (like PasteRectangle? but overstriking rather than inserting)
SortRectangle