script output:

Child 10.100.19.84 started
10.100.19.84: 
No response from 10.100.19.84
Child 10.100.19.84 exiting
Child 10.100.19.85 started
Found 10.100.19.85!
Child 10.100.19.86 started
Found 10.100.19.86!
Child 10.100.19.87 started
10.100.19.87: 
No response from 10.100.19.87
Child 10.100.19.87 exiting
Parent opening FIFO
Parent looping over remaining kids
Parent looping wait
Parent reaping 10.100.19.87
Parent reading fifo
Parent reaping 10.100.19.84
Parent reading fifo
Locking FIFO
appending to FIFO
Child 10.100.19.85 exiting
Parent reaping 10.100.19.85
Parent reading fifo
Parent got 10.100.19.85!
Locking FIFO
appending to FIFO
Child 10.100.19.86 exiting
Parent reaping 10.100.19.86
Parent reading fifo
Parent got 10.100.19.86!
Parent closing fifo
PONG: 10.100.19.85
PONG: 10.100.19.86
28674 unlinked /tmp/fileMVZqps

tcpdump:
10:27:38.255634 arp who-has 10.100.19.84 tell 10.100.19.1
10:27:39.255634 arp who-has 10.100.19.84 tell 10.100.19.1
10:27:40.255634 arp who-has 10.100.19.84 tell 10.100.19.1
10:27:48.255634 10.100.19.1 > 10.100.19.85: icmp: echo request (DF)
10:27:48.255634 10.100.19.85 > 10.100.19.1: icmp: echo reply
10:27:51.665634 arp who-has 10.100.19.86 tell 10.100.19.1
10:27:51.665634 arp reply 10.100.19.86 is-at 0:0:50:b:b3:7f
10:27:53.255634 arp who-has 10.100.19.85 tell 10.100.19.1
10:27:53.255634 arp reply 10.100.19.85 is-at 0:0:50:b:b3:7f
10:27:58.275634 10.100.19.1 > 10.100.19.86: icmp: echo request (DF)
10:27:58.275634 10.100.19.86 > 10.100.19.1: icmp: echo reply
10:28:02.375634 arp who-has 10.100.19.1 tell 10.100.19.85
10:28:02.375634 arp reply 10.100.19.1 is-at 0:7:e9:9:8a:dd
10:28:08.295634 arp who-has 10.100.19.87 tell 10.100.19.1
10:28:09.295634 arp who-has 10.100.19.87 tell 10.100.19.1
10:28:10.295634 arp who-has 10.100.19.87 tell 10.100.19.1