add more to script.

git-svn-id: https://svn.r-project.org/R/trunk@63404 00db46b3-68df-0310-9c12-caf00c1e9a41
more on cleanup, with an example

git-svn-id: https://svn.r-project.org/R/trunk@63405 00db46b3-68df-0310-9c12-caf00c1e9a41