[Rd] Conventions: Use of globals and main functions

[Abby Spurdle]

> "Running R" (in "R Installation and Administration") links to
> "Appendix B Invoking R" (in "An Introduction to R").
> However, these sections do not cover the topics in this thread.

Sorry, I made a mistake.
It is in the documentation (B.4 Scripting with R)
e.g.

(excerpts only)
R CMD BATCH "--args arg1 arg2" foo.R &
args <- commandArgs(TRUE)
Rscript foo.R arg1 arg2