Sampling without replacement using awk

Question

I have a lot of text files that look like this:

>ALGKAHOLAGGATACCATAGATGGCACGCCCT
>BLGKAHOLAGGATACCATAGATGGCACGCCCT
>HLGKAHOLAGGATACCATAGATGGCACGCCC         


        

Answer 1

Maybe it's better to sample the file using a fixed schema, like sampling one record each 10 lines. You can do that using this awk one-liner:

awk '0==NR%10' filename

If you want to sample a percentage of the total, then you can program a way to calculate the number of rows the awk one-liner should use so the number of records printed matches that quantity/percentage.

I hope this helps!