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1234 1    do-upgrades.pl.    <--- daemon
2345 1234 do-upgrades.pl     <--- forked process with system() call
2346 2345 upgrade-sensor.pl. <--- worker bee

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# read everything from the pipe.
my $pipename = "sensor-fifo";
...
    print "Finished waiting.\n";

}

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# read everything from the pipe.
my $pipename = "sensor-fifo";
...
    print "Finished waiting.\n";

}

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1234 1    do-upgrades.pl.    <--- daemon
2346 1234 upgrade-sensor.pl. <--- worker bee

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/usr/bin/nohup ${RFS_HOME}/do-upgrades.pl > ${WORK_PATH}/do.log &

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close (STDERR);
close (STDOUT);
...
open (STDOUT, "| tee -ai $logabspath");
open (STDERR, "| tee -ai $logabspath");
print "\n\n----------------------------------------------\n";

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$ uname -a
Linux toolchain 4.4.0-130-generic #156-Ubuntu SMP Thu Jun 14 08:53:28 
+UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

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$ uname -a
Linux oldtoolchain 2.6.32-754.17.1.el6.x86_64 #1 SMP Tue Jul 2 12:42:4
+8 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

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Child forked (pid=14825), 1 processes running now at ./do-upgrades.pl 
+line 49.

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Unknow process 0 has exited, ignoring it at ./do-upgrades.pl line 84