Hello, this is my first data analysis with PED and MAP file.

I started on Plink, first with tutorials.
I generated bim, fam and bed files from PED and MAP files,
the total number of samples is 6674 and I checked in the fam file.
What I wonder is how can I check the SNPs per sample?
In the bim file, there are 352227 rows of SNPs, is it right those SNPs are all in one sample in common?

I also generated raw file through "-recodeAD" and the size is too big to read in R (on Ubuntu).
Is there any method to split the file or some other tips to make smaller from the first?

Help for the first step, please.
Or let me know where I can refer to.

Thank you