I've tried many times on google. Can't find an answer. What is the command of clear window in mac version of R. PS: I know in windows version of R, you can use Ctrl+L. Thanks. -- Zhandong Liu Genomics and Computational Biology University of Pennsylvania 616 BRB II/III, 421 Curie Boulevard University of Pennsylvania School of Medicine Philadelphia, PA 19104-6160 [[alternative HTML version deleted]]