process MD5SUM { tag "$meta.id" label 'process_low' if (params.enable_conda) { exit 1, "Conda environments cannot be used when using bcl-convert. Please use docker or singularity containers." } container "debian:bullseye-slim" input: tuple val(meta), path(file) output: tuple val(meta), path("*.md5"), emit: checksum path "versions.yml" , emit: versions when: task.ext.when == null || task.ext.when script: def args = task.ext.args ?: '' def prefix = task.ext.prefix ?: "${meta.id}" """ md5sum \\ $args \\ ${file} \\ > ${file}.md5 cat <<-END_VERSIONS > versions.yml "${task.process}": md5sum: \$(echo \$(md5sum --version 2>&1 | head -n 1| sed 's/^.*) //;' )) END_VERSIONS """ }