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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Beyond retention and to help staff cover tax bills triggered when RSUs vest, they relieve pressure on management to pursue an IPO before the company is ready.