I have a vcf file with contains GT:DS:GP for FORMAT field, how can i only keep the GT?
The vcftools "--extract-FORMAT-info GT" command will at the same time filtering all other columns. But i wish to keep those.
> https://samtools.github.io/bcftools/bcftools.html
>
>... and "FORMAT" to remove all FORMAT tags except GT. 

    bcftools annotate -x 'FORMAT' in.vcf