GNU parallel is a command line utility to run programs in parallel

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Why does (GNU?) parallel fail silently, and how do I fix it?

In a larger script to post-process some simulation data I had the following line: parallel bnzip2 -- *.bz2 Which, if I understand parallel correctly (and I may not), should run n-core threads of ...
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split a file, pass each piece as a param to a script, run each script in parallel

I have a words.txt with 10000 words (one to a line). I have 5,000 documents. I want to see which documents contain which of those words (with a regex pattern around the word). I have a script.sh that ...