Change SNP ID strings in PLINK files

Question

[L_to_the_m]

Hi, I have PLINK files with SNP IDs like this:

AX-14233402__rs35404821
AX-37499887__rs74704183
AX-36783275__rs11997571

I would like to change the SNP IDs to have only the IDs without the AX-... term: rs35404821 rs74704183 rs74704183

For the .pvar file it wouldn't be a problem, but then I also need to change it within the .pgen file. Is there any solution for this? For the .pvar file it would be:

awk '{$3=A[split($3,A,"_")]}1' datafile.pvar > datafile_ID.pvar

[Sam]

Don't think the SNP ID is stored within the pgen file, so you should be good to go after modifying the pvar