Either one of these works under Linux. 'r' is our own littler (see Google for it), Rscript comes with R 2.5.0 or greater $ r -e 'suppressMessages(library(Rcmdr)); while (TRUE) Sys.sleep(1)' $ Rscript -e 'suppressMessages(library(Rcmdr)); while (TRUE) Sys.sleep(1)' Hth, Dirk -- Hell, there are no rules here - we're trying to accomplish something. -- Thomas A. Edison