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Is it possible to ‘instantly’ create arbitrary files?

I work on Linux centos. I want to fill the /var partition to check the system behavior. What is a quick way to fill the partition ? The /var is around 20GB and I want to fill around 18GB.

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migrated from stackoverflow.com Oct 31 '12 at 22:01

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marked as duplicate by Daniel Beck Oct 31 '12 at 22:09

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dd if=/dev/zero of=output.dat bs=1G count=18

your block size is 1GB and you write 18 blocks

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I don't think that count=0 will copy anything? –  Nikos C. Oct 31 '12 at 22:00
    
@NikosC. I'll just simplify it. –  New Alexandria Oct 31 '12 at 22:01
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