Kill a process (and any spawned subprocesses) by PID

kill_pid_group.sh

echo killing

# Get progress group id from pid
PGID=$(ps opgid `cat ${PID_PATH}` | grep -o '[0-9]*')
# Kill the process group
kill -- -$PGID
echo killed
# Now that it's killed, don't forget to remove the PID file
rm ${PID_PATH}