(Note: this only works in 10.4 and earlier. Leopard (10.5) no longer contains the NetInfo database or its associated utilities.)
To find the username:
That prints out the list of usernames in the NetInfo database. Hopefully you'll recognize which one is yours. Once you've got that:
where 'username' is your username. Enter a new password, confirm it, and then type 'reboot' to boot back into OS X.
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