killall
From Mac Guides
killall is a Terminal command used to kill processes by name. It sends a signal that tells the process to terminate.
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Examples
The following example kills the application iTunes.
killall iTunes
Most signals can be intercepted and ignored. To force-kill a process one has to send the KILL signal:
killall -KILL someprocess
To kill a process that runs under a different user:
sudo killall -KILL someprocess
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Man Page Excerpt
Killall kills processes selected by name, as opposed to the selection by pid as done by kill(1). By default, it will send a TERM signal to all processes with a real UID identical to the caller of killall that match the name procname. The super-user is allowed to kill any process.
