Kill All Processes Of Certain Application In Unix/Linux

This is a very helpful command I use regularly.

If your like me, you open several instances of applications like “VI” and leave them in the background, most of the time without meaning to.  Eventually you run a “PS -U” to view all your processes running and realize that theres 10 copies of the application running in the background which you havnt closed. Heres a command to quickly clear that up.
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