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> As a side note, I think the shell script version would have been multicore friendly, at least up to six cores.

That's not how the sort command, in lines 3 and 5, works.

It is how pipelines work, though. 6 commands, 6 processes all started at once. They're each allowed a core to themselves, if the kernel deems it so.

That's true, but it doesn't really count if only one of the threads is eligible to run at any one time and all the others are blocked.

But `sort` has to read all the input before writing any output (I think...). So you get some parallelism but not as much as you might hope.