discard the old line before updating the screen so that the line
tree487e8fd304d9a99b26b28608bee0cca4d2324159
-rw-r--r-- 5762 README
drwxr-xr-x - common
drwxr-xr-x - docs
drwxr-xr-x - ex
drwxr-xr-x - vi