Ryan's Blog

Using awk to randomly sample a file

Posted in Uncategorized by ryanlayer on January 6, 2012

Create a file with 1000 lines:

for i in {1..1000};do echo $i; done > f


export P=0.5
cat f | awk -v p=$P 'BEGIN{srand()} {r = rand(); if (r <= p) print}'

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