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For detailed usage instructions, make sure that the appropriate Install macOS app is in your Applications folder, then enter one of the following paths in Terminal: Examples of this command are in the next section.
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Use the createinstallmedia command in Terminal to create the bootable installer.Open the Terminal app, which is in the Utilities folder of your Applications folder.You could also use a secondary internal partition. Mount your USB flash drive or other volume.softwareupdate -fetch-full-installer -full-installer-version 11.0.1 Option 2: Download the macOS installer via terminal. The installer will be in your Applications folder. Quit the installer if it opens automatically after downloading. Option 1: Download the macOS installer from the Mac App Store. There are two options for downloading the macOS installer.Overview Use the createinstallmedia command in Terminal I personally use the w/Options command which include both the -nointeraction and &say Installation commands. Final macOS Executable Commands labled as Full Example or Full Example w/Options. The final executable command(s) are found within Section III.
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These advanced steps are intended primarly for system administrators and others who are familiar with the command line. With macOS, you can use a USB flash drive or other removable media as a startup disk from which to install macOS. The following instructions were predominantly sourced via this Apple Support Document.