Na coluna ping
(ênfase minha):
When the specified number of packets have been sent (and received) or if the program is terminated with a SIGINT, a brief summary is displayed. Shorter current statistics can be obtained without termination of process with signal SIGQUIT.
Então, isso funcionará se você estiver bem com suas estatísticas sendo um pouco menos detalhadas:
# the second part is only for showing you the PID
ping 8.8.8.8 & jobs ; fg
<... in another terminal ...>
kill -SIGQUIT $PID
Estatísticas resumidas são assim:
19/19 packets, 0% loss, min/avg/ewma/max = 0.068/0.073/0.074/0.088 ms