Below is invocation to create an OS X Yosemite USB Installer in the Terminal.
Invocation
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/Yosemite –applicationpath /Applications/Install\ OS\ X\ Yosemite.appResults
Ready to start.To continue we need to erase the disk at /Volumes/Yosemite.
If you wish to continue type (Y) then press return: Y
Erasing Disk: 0%… 10%… 20%… 30%…100%…
Copying installer files to disk…
Copy complete.
Making disk bootable…
Copying boot files…
Copy complete.
Done.
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Stephan Pringle
Technology Support Specialist at Sipylus
About The Author: Stephan Pringle is an Information Technology Support Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.