R history

So again, something I have been meaning to look into: R history. By default only 512 lines are saved. Often I like to tinker with something until I get worked out exactly what I want to do, so saving a perfect script from the word go is not an option. So: Sys.setenv(R_HISTSIZE = Inf) *should* save all of my history, which I can then export, edit and save as a .R file.