Delete a line like eclipse CTRL+D (tested on Xcode 4.5.1) :
First of all, change these rights :
sudo chmod 666 /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist
sudo chmod 777 /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/
Open /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist with
Xcode himself and add this new entry :
deleteToBeginningOfLine:, moveToEndOfLine:, deleteToBeginningOfLine:, deleteBackward:, moveDown:, moveToBeginningOfLine:
Restart Xcode and open Xcode > Preferences > KeyBindings. Find your macro and define a shortkey :
