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The parent perl script - parent.pl
---------------------------------------
...
print "I am b.pl\n";
sleep(6000000);
print "I am gonna die...\n";

[root@onong ~]# ps aux | grep a.sh
...
read(3, 0x17082210, 4096) = ? ERESTARTSYS (To be restarted) <---------
+----- DOESN"T RETURN 0
--- SIGCHLD (Child exited) @ 0 (0) ---
read(3, <----------------- KEEPS WAITING IN READ(2)

[root@onong ~]# ps aux | grep b.pl
root 29350 0.0 0.0 77884 1488 pts/4 S+ 03:15 0:00 /usr/bin/perl /root/
+b.pl
...
) = 15
exit_group(0) = ?