yepstat overwrites your very first terminal line every 0.5 seconds

yepstat is acting like status line that overwrites your very first
terminal line every 0.5 seconds, so you can easily keep track of
things that you are interested to monitor while hacking something in
the terminal. It's meant to be efficient and fast even when under 100%
cpu and drive I/O load.

This is exactly what we do: save the current position of the cursor,
move it to the top left corner of the terminal, clear the entire line,
output the desired data and restore the cursor position, so you get
the feeling that there is a real status line up there.