Sorry, forgot to included the information. Working in Windows (although a try on linux gave the same problems) R 2.10.0 Do you suggest to update a newer version of R? regards, Robbert -- View this message in context: http://n4.nabble.com/Pipe-shell-R-does-not-wait-tp1458692p1458727.html Sent from the R help mailing list archive at Nabble.com.