Not read the article yet, but this is something that is new to me but probably shouldn't be. Hopefully I'll remember it next time it might be useful!

Also scanning the sort documentation for other bits I'd not remembered/known, I notice --parallel=n – I'd just assumed sort was single-threaded, where it is not only capable of multicore sorting but does so by default. Useful to know when deciding when to do things concurrently by other means.