ame>                (-A, -c, -d, -r, -u, -x)
        Set the group of extracted and archived files to the group specified.
    --utc                                 (-t)
        Display timestamps as UTC instead of local time.
    -S, --sparse                          (-A, -c, -u)
        Detect sparse files and store them (gnu tar extension).
    --format <format>                     (-A, -c, -u, but also -d, -r, -x)
        The file format:
                  auto (gnu tar)
                  default (gnu tar)
                  tar (gnu tar)                  gnu (tar v1.13+),                   ustar (tar POSIX.1-1988),                   pax (tar POSIX.1-2001),
                  xar
                  cpio
        Note! Because XAR/TAR/CPIO detection isn't implemented yet, it
              is necessary to specifcy --format=xar when reading a
              XAR file or --format=cpio for a CPIO file.
              Otherwise this option is only for creation.