1 - Grab a copy of the 'Install OS X El Capitan.app' or the 'Install OS X El Capitan GM Candidate.app' from the App Store.
2 - Insert a blank USB flash drive in to your mac.
3 - Go to Applications > Utilities and open Terminal.app.
4 - Type the following command, all as one line, in to Terminal.app where 'Untitled' is the name of your USB drive.
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction
5 - Wait awhile and you're USB flash drive will be ready.
6 - To boot from your Flash drive, either go to Apple > System Preferences > Startup Disk and select your USB drive, or hold down 'Alt' while booting for the boot device selector screen.
Good Luck!
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