Erase free disk space from the command line

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Erase free disk space from the command line
Authored by: lowbatteries on Thu, Apr 24 2008 at 11:17AM PDT

As robdew pointed out, you can do this with diskutil. A good rule of thumb is that if Disk Utility can do it, diskutil can do it.

In fact, Apple is great at letting you do anything (and more!) from the command line - for example, the 'softwareupdate' command for auto-updates.