When you run git clone, it updates progress in place. For example, the percentage of the objects received changes in place.
git clone
user@athena:~/cloj/s
You'll have to use another method (like Curses) to update two lines in-place.
ablogaboutcode.com | web.archive.org
...and...
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/curses/rdoc/Curses.html