Pass shell environment variable to Rscript

Question

Is there a way to pass a shell environment variable to Rscript. For example:

Rscript -e 'devtools::install_github("private/repo",auth_token = "$GITHUB_CRED")'

I've tried this and it just passes the literal character. I'm wondering if there's another way?

Answer 1

Have you tried using Sys.getenv?

Rscript -e 'devtools::install_github("private/repo", auth_token=Sys.getenv("GITHUB_CRED"))'