The MergeGenotyperOutput utility merges the results of a parallel genotyping run into genome-wide output files.
In addition to merging the main VCF files, this utility will also merge the auxilliary output files (but leave them in the run directory).
-runDirectory <directory> : The run directory where the output files from
each partition are stored.-O <vcf-file> : The location to write the merged output VCF file.