: hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina
hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J Mount the image macos catalina 10157 iso download new
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Convert to ISO hdiutil detach /Volumes/Install\ macOS\ Catalina : hdiutil attach /tmp/Catalina