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
r_versions              Query R's past and present versions
