How to switch from Spotlight to Alfred via Terminal?
Solution 1:
Alfred requires Spotlight to function properly.
Alfred relies on the same OS X metadata index as Spotlight. As such, it's important for you to let Spotlight run on your Mac to maintain an index of the files on it.
http://support.alfredapp.com/kb:spotlight
This answer to a similar question provides a shell command to stop Spotlight's GUI only, which will disable Spotlight's shortcut.