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Securely erasing data from OS X is easy. But is there a way to securely erase all logfiles (including the system logs contained in some database) without actually messing the system up?

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Can't vouch as to whether this will muck up Mac OS X, but to securely delete the system logs, try this from command line:

sudo rm -P /var/log/*

(Mac OS X comes with the -P flag for rm which overwrites data 3 times - similar to shred IIRC)

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