H I want to use the system() command to execute a command and have to return the result in a r-variable, so I an using intern=TRUE. On the other hand, I want to evaluate the return value of the command, to determine if the command was successful. According to the help, these to objectives are exclusive, either the one or the other. Is this true, or is there another way of accomplishing this? My prefered return value would be a list, consisting of thre entries: return code of the command stderr and the result Thanks Rainer -- Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Faculty of Science Natural Sciences Building Private Bag X1 University of Stellenbosch Matieland 7602 South Africa