Parallel letter frequency in Bash

Bash folks, how would you feel about an implementation of this exercise that uses background processes and shares data via (temp) files?

Attn @IsaacG @kotp

While I think that is appropriate, I believe the test runner is running on a single core/single thread server. Just be aware that what you test is something that can be done there. (Disable unless testing locally, perhaps, as an option?)

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I feel like that’s a bit of a stretch and not well aligned with the rest of the track. I would be in favor of skipping.