Secure erase drive in Single User Mode My 2007 Macbook Pro has suffered from a failure of its GPU and will now only boot in Single User mode.  

I want to sell it on eBay for spares, but obviously I don't want a hard drive with live data on it ending up on eBay.  

I know you can destroy a drive's contents with a secure erase in Disk Utility, but as I said, I can't boot into any mode that requires graphics because the GPU is dead.  

How do I secure erase the machine's drive in Single User mode?
Normally from the command line, you would use the diskutil command with the zeroDisk, randomDisk or secureErase options to securely wipe a disk. However, I would imagine this doesn't work on the disk you've just booted from. So I suspect you'll either have to find another Mac and connect yours in target disk mode via a Firewire cable, or physically remove the drive and connect it to another Mac using a disk caddy, to wipe it the way you wish.