ubuntu kill process by name

                                    ps -ax | grep application name 

                                    # killall process name:
pkill firefox

To kill all the processes that you have the permission to kill,
simply run the command
kill -15 -1 or kill -9 -1 depending on the desired behavior 
(use man kill for details)

To kill a specific process, say, firefox,
simply run pkill firefox 
or killall firefox depending on the behavior you want: 
Whats the difference between 'killall' and 'pkill'?
'''
Pkill and killall both have distinguishing options. 
Killall has a flag to match by process age, 
pkill has a flag to only kill processes on a given tty. 
Etcetera ad nauseum. Neither is better, 
they just have different specialties.
If you want to see what processes are running use the command
'''

                                    #on a cluster #sbatch process 
scancel -u username