macosxcode
I now have two versions of Xcode installed:
Since I don't use either of those at the moment, how can I completely remove both?
Would removing both folder just do the job?
What about associated Library stuff?
If you have the latest Xcode (4.3.2 at time of writing) it should be in /Applications/Xcode. You may have an older Xcode in /Developer. /Developer is now no longer used by Xcode. You should remove it using the provided script if you don't need the old version any more. Execute
sudo /Xcode4/Library/uninstall-devtools --mode=all
and authenticate. When that script completes you can remove the /Developer folder entirely but you should allow Xcode's script to take care of its somewhat "fragile" installation first.
New Xcode lives in /Applications and is much more like a conventional Mac OS X app these days. Lots more information about putting it in the dock, finding other developer apps, command line tools etc. in this other answer of mine.
Yes, it looks like it should be safe to remove /Developer if you have already installed version 4.3 or later of Xcode. The Xcode section of the Apple Developer Support Center actually tells you to do this (emphasis mine).
I've installed the latest version of Xcode from the Mac App Store, but a previous version of Xcode (4.2.1 or earlier) keeps launching. What should I do?
To run the latest version of Xcode, make sure you are launching Xcode.app from the Applications folder. Xcode 4.3 and later is packaged on the Mac App Store as a single application and installs in your Applications folder as Xcode.app.
Previous versions of Xcode placed the tools and frameworks in the Developer folder. You can delete the older version of Xcode by dragging the Developer folder to the trash.
Furthermore, as pointed out by bispymusic, /Developer no longer exists with Xcode 4.3. Specifically (emphasis mine):
The simplification afforded by repackaging Xcode 4.3 as a single app bundle eliminates the need for the
/Developerdirectory containing prior versions of Xcode. As a result, the Install Xcode application and theuninstall-devtoolscommand line script are also no longer needed.Note: The first time you run Xcode 4.3, you are prompted with a dialog to delete the Install Xcode application from the Applications directory if one is resident, and to remove any older installation of Xcode (Figure 4). These actions are optional, Xcode 4.3 can co-exist with older installations of Xcode on the same Mac. Some operations may require an administrator password to enable them if you switch from one version of Xcode to another.
Figure 4 Option to remove older versions of Xcode
If you choose not to delete these items on the first launch of Xcode 4.3, you can remove the
/Developerfolder and the Install Xcode application by dragging them to the Trash at any time.
Best Answer
Xcode comes with an uninstaller. Just run