params.fastq = "$baseDir/data/fastq/*.fastq" log.info "fastq files : ${params.fastq}" Channel .fromPath( params.fastq ) .ifEmpty { error "Cannot find any fastq files matching: ${params.fastq}" } .set { fastq_files } process trimming { tag "$reads.baseName" cpus 4 input: file reads from fastq_files output: file "*_trim.fastq.gz" into fastq_files_trim script: """ UrQt --t 20 --m ${task.cpus} --gz \ --in ${reads} \ --out ${reads.baseName}_trim.fastq.gz \ > ${reads.baseName}_trimming_report.txt """ }