hdiutil attach /Applications/Install\ macOS\ Catalina.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_esd hdiutil create -o NewBaseSystem -size 8500m -layout SPUD -fs HFS+J hdiutil attach NewBaseSystem.dmg -noverify -mountpoint /Volumes/install_build asr restore -source /Applications/Install\ macOS\ Catalina.app/Contents/SharedSupport/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase rm -rf /Volumes/macOS\ Base\ System/System/Installation/Packages cp -R /Volumes/install_esd/Packages /Volumes/macOS\ Base\ System/System/Installation hdiutil detach /Volumes/macOS\ Base\ System/ hdiutil detach /Volumes/install_esd/ mv NewBaseSystem.dmg BaseSystem.dmg
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