以 OS X 10.9.5 Mavericks 为例，一共12个命令：

$ hdiutil attach /Applications/Install\ OS\ X\ Mavericks.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app

$ hdiutil create -o /tmp/mac.cdr -size 7316m -layout SPUD -fs HFS+J

$ hdiutil attach /tmp/mac.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/install_build

$ asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase

$ rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages

$ cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/

$ cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/System/BaseSystem.chunklist

$ cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/BaseSystem.dmg

$ hdiutil detach /Volumes/install_app

$ hdiutil detach /Volumes/OS\ X\ Base\ System/

$ hdiutil convert /tmp/mac.cdr.dmg -format UDTO -o /tmp/mac.iso

$ mv /tmp/mac.iso.cdr ~/Desktop/OSX10.9.5.iso