I want to remove all existing SDK versions as well as Xcode 4.
Xcode 4 Guide says to do this:
sudo /Xcode4/Library/uninstall-devtools --mode=all
Ensure Xcode, iOS Simulator, and the Mac App Store apps aren't running, then trying running the uninstall script at this (different!) location:
/Library/Developer/Shared/uninstall-devtools
This is where I found it.
Also delete Install Xcode.app
from Applications folder, and Empty Trash.
Then run App Store again, and find/install Xcode.
I tried to uninstall this by deleting it, but the AppStore still thought that it was installed. I deleted some preferences files in my /private directory, which made the AppStore "forget" that I had installed Xcode. I used the following command:
sudo find / -iname '*xcode*' 2> /dev/null | egrep '^/private.*' | xargs -I file sudo rm -rfv file
Which deleted the following files from my computer:
/private/var/db/receipts/com.apple.pkg.XcodeMAS_iOSSDK_6_1.bom
/private/var/db/receipts/com.apple.pkg.XcodeMAS_iOSSDK_6_1.plist
/private/var/folders/7d/n34963zx62s7znxyzn3dn6bh0000gq/C/com.apple.Xcode.503/CachedSpecifications-Xcode
/private/var/folders/7d/n34963zx62s7znxyzn3dn6bh0000gq/C/com.apple.Xcode.503/CachedSpecifications-xcodebuild
/private/var/folders/7d/n34963zx62s7znxyzn3dn6bh0000gq/C/com.apple.Xcode.503
I do not know what these files are used for, but it made the AppStore forget that it was installed, which is what I needed to happen. In my case, the AppStore was not allowing me to update to the new version of Xcode.
I use this command:
sudo /Developer/Library/uninstall-devtools --mode=all
Edit (1 year later):
If you've downloaded Xcode from the App Store, it's self-contained, as @mediaslave suggests. You can just drag it to the trash or use AppZapper (or a similar utility) to remove the developer tools.
If you're looking to update it, you can also do that straight through the App Store.
sudo /[xcode-path]/Library/uninstall-devtools --mode=all
Normally, [xcode-path] means /Developer, but if you have multiple versions, for example 3 is the first installed, 4 is second, /Developer will be xcode 3's root derectory and /Xcode4 for xcode 4.
su
(or sudo su
, whatever)
find / -name uninstall-devtools
This will reveal where the utility is...
If you have XCode 4.3.1, just Move To Trash the XCode.app file in the Applications folder.