When running ANGSD/realSFS, how can I exclude data from a specific chromosome, such as the X chromosome?

[kuangzhuoran]

My command is:
angsd -bam p1.bam.list -doSaf 1 -out p1 -anc anc.fa -GL 2 -P 4 -only_proper_pairs 1 -uniqueOnly 1 -remove_bads 1 -minQ 20 -minMapQ 3;
angsd -bam p2.bam.list -doSaf 1 -out p2 -anc anc.fa -GL 2 -P 4 -only_proper_pairs 1 -uniqueOnly 1 -remove_bads 1 -minQ 20 -minMapQ 3;
realSFS -P 30 p1.saf.idx p2.saf.idx > sfs;

It is certainly possible to remove the X chromosome data from the BAM files, but this would require additional time and storage. I would like to know whether ANGSD or realSFS provides an option to do this.

I have seen that realSFS allows using a specific chromosome with the -r chr1 option.

I tried removing the X chromosome sequence from the anc.fa file, but the software halts when it reaches the X chromosome. Unfortunately, the X chromosome is listed near the top in the chromosome order.