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not sure i understand what you are asking, but i typically will run ps ax | grep (application name i am looking for) if nothing comes up, then i just run ps ax and scroll up looking for the PID, then i will try first kill -9 PID as that is supposed to kill the program + all other applications/programs that are running along with that PID.
my question is if the parent id is 1, can we still kill?
Yes, you can kill a process even if it's parent is "1" to kill a process, you must either own it or be the root user (i.e. sudo). There are a number of processes that show up with the name in brackets like: