r2dup2

Remy Chaput
Dec 20, 2021
Code
Using r2dup2 and its result

In R, the default utils::capture.output function only redirects R messages: it does not truly redirect the system streams, and thus fails with sub-processes, such as pandoc when using RMarkdown.

r2dup2 provides a way to truly redirect the error stream (stderr), by using the with_redirect_stderr function:

r2dup2::with_redirect_stderr(file = "error.txt", {
  system("echo >&2 This line will be printed to error.txt")
})

r2dup2 is only available on GitHub, install it with the remotes package:

install.packages("remotes")
remotes::install_github("rchaput/r2dup2")
R