Format HD from a command line?

Hi
I recently installed an update and now when I turn on computer i get the following message "Login Window Starting" and it just hangs. I have tried the fsck process and safe start and neither fix the problem. I don't have the disks to do the Utilities thing. All i want to do is format the hard drive as I am giving the computer away - is there anyway I can do this from the command line or is there any other way of gaining access to the machine?

Boot the iBook in Target Disk Mode. To do this, depress the T key at startup. Then using a firewire cable, connect the iBook to another Mac. On the other Mac, you should see the icon of the iBook's HD. Then you can use the other Mac's Disk Utility to erase the iBook's HD.
 Cheers, Tom

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Format HD from a command line?

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