Hi I am sure I can customize it, but I could not find it. When tangling R code, I would like to skip (or customize) the first line of the resulting R file. It reads "#!/usr/bin/env Rscript" and I would either like to exclude it completely, or replace it with e.g. "## R" I am sourcing the files anyway from a different R session and I don't need to execute them directly. Cheers, Rainer -- NEW GERMAN FAX NUMBER!!! Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Natural Sciences Building Office Suite 2039 Stellenbosch University Main Campus, Merriman Avenue Stellenbosch South Africa Cell: +27 - (0)83 9479 042 Fax: +27 - (0)86 516 2782 Fax: +49 - (0)321 2125 2244 email: Rainer@krugs.de Skype: RMkrug Google: R.M.Krug@gmail.com