hello every one, i am trying to compare two vcf files generate by using bcf tools and i am use this command for compare and find comman snp position between in these two files-

vcf-isec -n +2 input_1.vcf input_2.vcf | bgzip -c > output.vcf.gz

but i am getting error .. i would like to appreciate if any one please suggest me best command which i use for comparing of both files. thanking you all