Multiple input and multiple output in a pipeline

[zillur rahman]

Hi, I am a new user of nextflow. I have test1.bed, test1.bim, test1.fam files. I want to do some qc using plink in nextflow. How can I import those three files in nextflow and get output test2.bed, test2.bim, test2.fam which will be used in the next step to generate test3.bed, test3.bim, test3.fam and so on? I also need to save all the intermediate files in a directory. Any help with example?
Kind regards, Zillur