Create Mac OS X boot disk image

Go into the downloaded installer app, e.g.

cd /Applications/Install\ OS\ X\ Yosemite.app/

and go into the Resources/MacOS folder, in the Terminal.

cd Resources/MacOS/

look for an executable called "increateinstallmedia".

If you can't find, it, try

find ./ -name "createinstallmedia" -print

Once you find it, run this:

./createinstallmedia --volume /path/to/target --applicationpath /Applications/Install\ OS\ X\ Yosemite.app/ --nointeraction

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