How to filter multi-VCF for positions that have an SNP (in contrast to the reference) across all samples?

Question

[goatsrunfaster]

I have a VCF file that looks something like below:

POS ID  REF ALT QUAL    FILTER  INFO    FORMAT  AE017334    Mie_1969_DRR128187  Tokyo_1928_DRR150094    Shiga_1987_DRR128186    Morioka_ND_DRR128181
187 .   T   C   .   PASS    WT=350;HOM=8;NC=0;AC=8;AN=73    GT  0   0   1   0   0
228 .   C   T   .   PASS    WT=356;HOM=2;NC=0;AC=2;AN=73    GT  0   0   1   0   0
1981    .   A   G   .   PASS    WT=355;HOM=2;NC=1;AC=2;AN=73    GT  1   1   1   1   1
2578    .   A   G   .   PASS    WT=347;HOM=11;NC=0;AC=11;AN=73  GT  0   0   0   0   0
5638    .   G   A   .   PASS    WT=356;HOM=2;NC=0;AC=2;AN=73    GT  0   0   1   0   0
15763   .   C   A   .   PASS    WT=357;HOM=1;NC=0;AC=1;AN=73    GT  0   0   0   1   0
16963   .   A   G   .   PASS    WT=357;HOM=1;NC=0;AC=1;AN=73    GT  1   1   1   1   1

Note that I want to filter it to only keep positions such 1981 and 16963. How do I filter to only keep positions that have the same SNP across all samples?

[Pierre Lindenbaum]

please, review your previous questions and flag them as answered or add a comment. C: How to filter .vcf based on .gbk file to remove SNP calls in non-CDS regions? (green mark on the left); C: Identify fixed differences between population in WGS data (VCF Format) ; A: Merge VCF files with diploid reference calls in different order for same positio ....

[Pierre Lindenbaum]

have a look at bcftools view + option -i