How to clear Processing's bottom pane (for debugging)

Projects Interfacing w/ Software on the Computer
1

Hello. While the Processing program is running, the bottom pane which prints the output of "println()" function keeps on flooding till I stop the program. Is it possible to make the code clear the screen in that bottom pane?
I tried this but it didn't work : Runtime.getRuntime().exec("clear");

My laptop runs Ubuntu GNU/Linux 13.04 and Processing 2.1.