Use a command on multiple files

Question

[utkarsh.sood]

Hi,

I want to give two files as input in the following command using loop and generate two respective files as output

File 1: File1_1.fastq.gz
File 2: File1_2.fastq.gz

bbduk.sh -Xmx1g in1= in2= out1= out2= ref=adapters.fa ktrim=r

Thanks

[Pierre Lindenbaum]

What did you try? https://www.google.com/search?q=loop+multiple+variables+bash