Gets the pathname or a connection to the NULL device on the current platform.
nullfile()
nullcon()nullfile() returns a character string, which is "/dev/null"
except on Windows where it is "nul:".
nullcon() returns a newly opened (binary) connection to
the NULL device - make sure to close it when no longer needed.
In R (>= 3.6.0), there exists base::nullfile(), which is
identical to R.utils::nullfile().