RiKi,

that is fortunately very easy to do on the Mac and Linux with the bang 
and Rscript:

         #!/usr/bin/env Rscript --vanilla
         local({
                r <- getOption("repos")
                 r["CRAN"] <- "https://cloud.r-project.org/";
                options(repos = r)
         })
         update.packages()

I have no idea whether Rscript even exists on Windows and if so, how to 
call it.

greetings, el

On 19/01/2021 00:12, Richard Kimberly Heck wrote:
[...] 
> Presumably one could script the R session itself so that the needed
> object was exported?  I.e., can one do that from the command line?
> That's the kind of thing that an external template would do.
[...]

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