For the third developer beta same routine: sudo /Applications/Install\ macOS\ High\ Sierra\ Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled –applicationpath /Applications/Install\ macOS\ High\ Sierra\ Beta.app –nointeraction For older versions check Apple’s HT201372: https://support.apple.com/en-is/HT201372

Business as usual: sudo /Applications/Install\ macOS\ High\ Sierra\ Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled –applicationpath /Applications/Install\ macOS\ High\ Sierra\ Beta.app –nointeraction For older versions check Apple’s HT201372: https://support.apple.com/en-is/HT201372

Business as usual: sudo /Applications/Install\ macOS\ 10.13\ Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled –applicationpath /Applications/Install\ macOS\ 10.13\ Beta.app –nointeraction For older versions check Apple’s HT201372: https://support.apple.com/en-is/HT201372