Terminal applications have a “cursor” that they can move around, just like a text editor. You can tell that cursor “go to line 3, delete everything, then print out this new text” by using VT100 sequences. And you can use it to replace existing characters with new ones, without re-emitting a whole line.
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It started with a flash of insight like a thunderbolt in a snow storm, the sort of insight that can only be induced by high altitude hypoxia and making breakfast.
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