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Gregg Randolph : please see /project/gtl/data/raw/ALF1/16S/tfmergedreads where I made mergereads.nf, teton.conf and edited trim_merge.pl to trim_mergecab.pl (initially this was because I didn't have permissions to run the file, so I copied it, but I found I need to make some changes, with are in the *cab.pl version).  You run the nextflow script with: module load nextflowand nextflow run -bg mergereads.nf  -c teton.config. See inside of mergereads.nf for other ways of running it (i.e., not in the background). I tried this on pair of input files and one of the vsearch steps in the middle fails because the inputs are too small. But the nextflow script completes. Please have a look and see what you find and can figure out. It might be that some of the input files are genuinely too small.

I can see that the trimming step is working. You can see this in output/trimmed/. But we're not getting other files (in unmerged/, joined/, and in output/ itself.).

Logs and other files for debugging will be typically be in work/ For example, see work/ff/d9576360a5295e6c92a0183e485944/.command.log and neighboring files with ls -al work/ff/d9576360a5295e6c92a0183e485944/. In this case I think vsearch is silently failing to write anything. Importantly, you can see the command that was being run, to debug: see work/ff/d9576360a5295e6c92a0183e485944/.command.sh