Utilities for checking whether the sources of an R add-on package work correctly, and for building a source package from them.
R CMD check [options] pkgdirs
R CMD build [options] pkgdirsa list of names of directories with sources of R
    add-on packages.  For check these can also be the filenames of
    compressed tar archives with extension .tar.gz,
    .tgz, .tar.bz2 or .tar.xz.
further options to control the processing, or for obtaining information about usage and version of the utility.
R CMD check
  checks R add-on packages from their sources, performing a wide
  variety of diagnostic checks.
R CMD build builds R source tarballs.  The name(s) of the
  packages are taken from the DESCRIPTION files and not from the
  directory names. This works entirely on a copy of the supplied source
  directories.
Use R CMD foo --help to obtain usage information on
  utility foo.
The defaults for some of the options to R CMD build can be
  set by environment variables _R_BUILD_RESAVE_DATA_ and
  _R_BUILD_COMPACT_VIGNETTES_: see ‘Writing R Extensions’.
  Many of the checks in R CMD check can be turned off or on by
  environment variables: see Chapter 6 of the ‘R Internals’ manual.
By default R CMD build uses the "internal" option to
  tar to prepare the tarball.  An external tar
  program can be specified by the R_BUILD_TAR environment
  variable.  This may be substantially faster for very large packages,
  and can be needed for packages with long path names (over 100 bytes)
  or very large files (over 8GB): however, the resulting tarball may not
  be portable.
R CMD check by default unpacks tarballs by the internal
  untar function: if needed an external tar
  command can be specified by the environment variable
  R_INSTALL_TAR: please ensure that it can handle the type of
  compression used on the tarball.  (This is sometimes needed for
  tarballs containing invalid or unsupported sections, and can be faster
  on very large tarballs.  Setting R_INSTALL_TAR to tar.exe
  has been needed to overcome permissions issues on some Windows
  systems.)
The sections on “Checking and building packages” and
  “Processing Rd format” in “Writing R Extensions”
  (see on Unix-alikes the doc/manual subdirectory of the R source tree,
   on Windows, see the Manuals sub-menu of the Help menu on the console).