Provided by: vcftools_0.1.16-1build1_amd64 

NAME
fill-aa - fill in ancestral alleles
SYNOPSIS
fill-aa [OPTIONS]
DESCRIPTION
zcat file.vcf.gz | fill-aa -a ancestral-alleles.fa.gz | bgzip -c > out.vcf.gz
OPTIONS
-a <file.gz> file containing acestral alleles