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xargs -P N spawns up to N worker processes. -n 40 means each grep command gets up to 40 file names each on the command line.
There are 4 alternatives - vote for the best!
Parallel does not suffer from the risk of mixing of output that xargs suffers from. -j+0 will run as many jobs in parallel as you have cores.
With parallel you only need -0 (and -print0) if your filenames contain a '\n'.
Parallel is from https://savannah.nongnu.org/projects/parallel/
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