SHELL

linux kill process by pid

kill -9 3827

kill a process with pid

kill -9 PID # kill -9 94228

kill pid

lsof -i:3000           // Change 3000 to whatever your port is!
sudo kill 9 <PID>      // Change <PID> to the Pid number the above command returns 

kill process from pid

kill SIGNAL PID

#Example
kill -9 3827

#See more information from : https://www.linux.com/training-tutorials/how-kill-process-command-line/

kill pid

Find PID of process to kill with:
ps ax
Then just specify "kill PID" command as for example:
kill 16320
kill -9 16320 	#Force kill in case process is not answering.