- download upgrade from appstore
- prepare an USB stick with ~ 5GB space; format journaled with GUID partition table
- use the following command
sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Stick --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction
where Stick
is the name of your USB stick.
Taken from http://www.macwelt.de/ratgeber/Mavericks-vom-USB-Stick-installieren-8294693.html