Reference

Version labels
r_oldrel()	Version number of R-oldrel
r_release()	Version number of R-release
r_release_macos()	Latest R release with a macOS installer available for download
r_release_tarball()	Latest release for which a source tarball is available for download
r_release_win()	Latest R release with a Windows installer available for download
All R versions
r_versions()	Query R's past and present versions