Update a Line in Standard Output

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The trick is to use \r (return) instead \n (return and new line). I will use Python to illustrate. The following Python code

import sys

for idx in range(5):
    sys.stdout.write(f'\nLine {idx}')

outputs the following lines.

Line 0
Line 1
Line 2
Line 3
Line 4

while the following Python code

:::Python
import sys

for idx in range(5):
    sys.stdout.write(f'\rLine {idx}')

outputs `Line i` (where i runs from 0 to 4)
to the same line in standard output.