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Here the !!:1 will take the first parameter from the previous command. This can be used in conjunction with other history commands like ! and so on.
with grep for em:name rather than name, you will get much better result.
if you dont want to alias also then you can do
killall rapidly_spawning_process ; !! ; !! ; !!
See more details at http://blog.amit-agarwal.co.in/2008/12/01/get-you-ip-address-like-whatismyipcom/