Making A Boot USB Disk of OSX 10.9 Mavericks via Terminal

How to create the OSX 10.9 Mavericks Bootable Drive via Terminal

Mount the InstallESD.dmg buried deep in the app

hdiutil attach /Applications/Install\ OS\ X\ 10.9\ Developer\ Preview.app/Contents/SharedSupport/InstallESD.dmg

Swap to the newly mounted image

cd /Volumes/InstallESD.dmg -noverify

This puts you back in the Finder in front of the newly mounted InstallESD.dmg, go back to Terminal and clone the BaseSystem.dmg to the remote USB drive

sudo asr restore -source /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg -target /Volumes/YourDisk -erase -noverify

This will change ‘YourDisk‘ to ‘OS X  Base System‘

Remove the existing Packages alias link from the newly restored image

rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages

Copy the full OSX Mavericks Packages over to the new image

cp -R /Volumes/OS\ X\ Install\ ESD/Packages/ /Volumes/OS\ X\ Base\ System/System/Installation/Packages

And there it is! – to eject the new bootable USB OSX Mavericks 10.9 disk ’cd’ to home and eject

cd ~/

hdiutil eject /Volumes/OS\ X\ Base\ System/

Now you can boot up from your newly bootable disk and either Install OSX10.9 on another device or use the Terminal/Disk Utility or Firmware Password Utility utilities

from:http://www.coolestguyplanettech.com/making-a-boot-usb-disk-of-osx-10-9-mavericks/