How to do a count of SNPs per gene(set) from the plink.set.table output

Question

[Avoks]

How can I possibly do a count of the SNPs by set in the plink.set.table output? I have a long list of genes and an even longer list of SNPs that have been grouped into sets, the sets being the genes, in Plink giving the aforementioned output. The presence or absence of a SNP in a set is indicated by 1 or 0 respectively creating a kind of matrix. I would like to know the count of SNPs per gene (set)...something like what the summary() in R will give, I reckon. Help please.