If I start from within R a new R batch job by using something like system("R CMD BATCH --no-save --quiet Rin.txt Rout.txt", intern=FALSE, ignore.stderr=TRUE, wait=FALSE, input=NULL) the job runs fine and smooth. However, when, for any reason, I put twice ctrl+C in the calling R, it kills me the called batch job, too. This is not what I wanted. Ctrl +C is usually rather used to stop a loop etc. Why it stops the called batch jobs, too? What can be the solution for me - avoiding the called batch jobs to be killable from the calling R process? Best regards Meinhard PS system: MacOS 10.4.9 Intel, R 2.5.0