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Convert gzipped files to zip using named pipes and parallelism (with xargs)
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| find *.gz | xargs -n 1 -P 4 -I{} bash -c 'f={}; mkfifo ${f%*.gz}; zip -9 -v -FI ${f%*.gz}.zip ${f%*.gz} & gunzip -cd $f > ${f%*.gz} && rm ${f%*.gz}' |
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