Awesome

XcodeKit

Duplicate / Remove current line or selection in Xcode

####To install pre-compiled plugin:

• Download XcodeKit.xcplugin.zip (old version)
• Unzip and put it into your ~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/
• Restart Xcode and you should see to new menu items in Edit menu:

Delete Selection / Line and Duplicate Selection / Line

You can add shortcuts to these commands from System Preferences -> Keyboard -> Shortcuts -> App Shortcuts...