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Shuffle contents of a csv file without breaking headers
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| sed -n '1!p' data.csv | perl -MList::Util=shuffle -e 'print shuffle(<STDIN>);' > shuffled.csv | |
| head -1 data.csv >> tmp & cat shuffled.csv >> tmp | |
| mv tmp shuffled.csv | |
| # You can also use "awk 'NR>1' data.csv", but it will be slower |
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