@phil_PICS: The -A option. ccze uses ncurses by default, and the screen's cleared when doing son. With -A, it will use direct ANSI escape sequences, which is less portable, but doesn't clear the screen.
After quite a few years of neglecting the project, I'm working on a new version. I will not continue the old code, but will start anew.
This, however, will take a while.