$ cat a.vcf| go-vcf filter --keep-ids ids.txt --keep-pos pos.txt

$ cat a.vcf| go-vcf freq

$ cat a.vcf| go-vcf subset --keep-index 0

$ cat a.vcf| go-vcf to-tab

$ cat a.vcf| go-vcf update --rs-merge-arch RsMergeArch.bcp.gz

$ cat a.vcf| go-vcf fill-rsids --bucket b142_GRCh37