...
- https://www.gnu.org/software/parallel/parallel_tutorial.html
- https://www.biostars.org/p/63816/
- http://www.shakthimaan.com/posts/2014/11/27/gnu-parallel/news.html
- https://www.msi.umn.edu/support/faq/how-can-i-use-gnu-parallel-run-lot-commands-parallel
- https://github.com/LangilleLab/microbiome_helper/wiki/Quick-Introduction-to-GNU-Parallel
- https://davetang.org/muse/2013/11/18/using-gnu-parallel/
- https://sites.google.com/a/stanford.edu/rcpedia/parallel-processing/gnu-parallel-examples
- http://phili.pe/posts/free-concurrency-with-gnu-parallel/
