With the following command and the setup of the xx.file, mothur should not create new files for each sample because the samples are already separated by sample.
I believe I’m currently experiencing the same problem. I.e. most of my seqs end up in the scrap file after running the make.sra command, either straight from the fastq with oligos file or using “file=xx.file”.
I followed your advice from the previous post, generating a merge fastq from: make.contigs(ffastq=xx.R1.fastq, rfastq=xx.R2.fastq), trim.seqs(), and make.fastq(fasta=current, qfile=“current”.qual).
Then using the merged fastq and an oligos file to generate sample/group specific fastq files.