How to uninstall older version of Xcode
sudo <Xcode>/Library/uninstall-devtools --mode=allwhere <Xcode> is the path to the Developer folder (the one with 'Xcode 3.2.5' in it)This won't affect the 'Xcode 4.0.2' installation since it's in a completely different folder.
- Your XCode 4.x is installed in your
/Applications/ folder - The old XCode 3.x is installed in
/Developer/and can be independently uninstalled by running the following command :
sudo /Developer/Library/uninstall-devtools –mode=all
It is a nice mv from the XCode Apple Developers Team :)