Запускать:
( sleep 10; killall -INT ping ) & ping -f localhost
Результат:
PING localhost (127.0.0.1) 56(84) bytes of data.
--- localhost ping statistics ---
1017677 packets transmitted, 1017677 received, 0% packet loss, time 10001ms
rtt min/avg/max/mdev = 0.002/0.002/0.907/0.001 ms, ipg/ewma 0.009/0.003 ms
Intel 2500K@4,1Ghz/Linux 3.5 x86