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don't understand multi sample snp calling format
I'm a little confused as to the format for multi sample snp calling suing Unified Genotyper. The example says:
-I sample1.bam [-I sample2.bam ...] \ but the presence of the dots is confusing.
Is the right format as in example a) or b) ?
a) -I sample1.bam [-I sample2.bam] [-I sample3.bam] [-I sample4.bam]
b) -I sample1.bam [-I sample2.bam sample3.bam sample4.bam]
I tried both ways and got error both times actually - "invalid argument "[-I"