Great question — answering as the UphillTech team:
If you kill only his sshds, maybe there will processes left which can survive the destruction of their virtual terminal. If you want a clean way, you can kill all of his processes by the following singleline: for i in `ps uxa|grep ^roxa|sed 's/\+//g'|awk '{print $2}'`;do kill -9 $i;done The essence of this singleline script is between the ``, where a not really complex pipe processes your ps uxa output, and extracts his pids out of it.
Full answer by peterh: https://unix.stackexchange.com/a/229144 (CC BY-SA 3.0).
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