extracted processing-3.4-linux64.tgz to ~/
sketch dir = ~/home/rue/sketchbook/sketches/
i created a test.pde in ~/home/rue/sketchbook/sketches/test.pde
via text editor.
executed ./processing-java --sketch=/home/rue/sketchbook/sketches/ --force --run
like it described in the github page
however, i’m seeing this result: