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# Create a blank disk image (8GB minimum) hdiutil create -o /tmp/Mojave -size 8g -layout SPUD -fs JHFS+ hdiutil attach /tmp/Mojave.dmg -noverify -mountpoint /Volumes/InstallMojave Write the installer to the mounted image sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/InstallMojave --nointeraction Detach the image hdiutil detach /Volumes/InstallMojave Convert the image to ISO/CDR format hdiutil convert /tmp/Mojave.dmg -format UDTO -o ~/Desktop/Mojave.iso Rename the file (remove .cdr extension) mv ~/Desktop/Mojave.iso.cdr ~/Desktop/Mojave-10.14.6.iso