From LQWiki
The killall command kills processes by name, alleviating the need to run ps to find the pid before issuing a kill command. Signals other than the kill signal can also be sent.
Caution should be used on non-Linux systems, where killall may have a different behavior, like killing all processes attached to the current terminal.
Example
$ killall mozilla-bin
Kills a locked-up Mozilla browser.
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