Se você não quer conseguir coisas através do gerenciador de janelas, tente wmctrl :
-r <WIN> -e <MVARG> Resize and move the window around the desktop.
The format of the <MVARG> argument is described
below.
<MVARG> Specifies a change to the position and size
of the window. The format of the argument is:
<G>,<X>,<Y>,<W>,<H>
<G>: Gravity specified as a number. The numbers are
defined in the EWMH specification. The value of
zero is particularly useful, it means "use the
default gravity of the window".
<X>,<Y>: Coordinates of new position of the window.
<W>,<H>: New width and height of the window.