Mac OS X Hacks provides direct, hands-on solutions that can be applied to the challenges facing both those meeting the Mac for the first time and long-time users delving into Mac OS X and its Unix underpinnings. Mac OS X Hacks is the third in O'Reilly's new Hacks Serier which aims to begin reclaiming the term 'hacking' for the good guys.
These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to install macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Download macOS
Download a macOS installer.* You can find the appropriate download link in the upgrade instructions for macOS Catalina, macOS Mojave, macOS High Sierra, macOS Sierra, and OS X El Capitan.
Then find the installer in your Applications folder as a single ”Install” file, such as Install macOS Catalina.
Use the 'createinstallmedia' command in Terminal
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument, similar to the way this argument is used in the commands for Sierra and El Capitan.
![]() Use the bootable installer
After creating the bootable installer, follow these steps to use it.
Learn more
For more information about the
createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Catalina:
Mojave:
High Sierra:
Sierra:
El Capitan:
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