There are a number of ways to kill a process if you know the name of the process. Here’s a couple different ways you can accomplish this. We are going to assume that the process we are trying to kill is named irssi linux

kill $(pgrep irssi)

 

killall -v irssi

 

pkill irssi

 

kill `ps -ef | grep irssi | grep -v grep | awk ‘{print $2}’`

These techniques can be useful in shell scripts, where you wouldn’t know the process ID and would need to restart or kill a process.

Source: http://www.howtogeek.com/howto/ubuntu/kill-a-process-by-process-name-from-ubuntu-command-line/

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