Run RMarkdown with arguments on the command line
Adding the myarg object as a parameter is the way to go:
Rscript -e "rmarkdown::render('example.Rmd',params=list(args = myarg))"
And then add the parameter to your Rmd file:
---title: "Simple example"output: pdf_document: defaultparams: args: myarg---Documentation on parameterized reports here: https://rmarkdown.rstudio.com/developer_parameterized_reports.html