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for ($i=1;$i<=10;$i++) { print "$i\n" };
for ($j=10;$j>=1;$j--) { print "$j\n" };
...
3
2
1

$pid = fork();
...
} else {       ### This is the parent process
   for ($i=1;$i<=10;$i++) { print "$i\n" };
}

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