In-place progress output in the terminal or console

Use carriage return. '\r' should usually work.

...        eol = done ? done : "   \r";...                fprintf(stderr, "...%s", ..., eol);                fflush(stderr);

Git simply emits a carriage return and no line feed, which the terminal interprets as "move to first column".

ruby unix terminal ncurses

You'll have to use another method (like Curses) to update two lines in-place.

...and...

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