for ($i=1;$i<=10;$i++) { print "$i\n" };
for ($j=10;$j>=1;$j--) { print "$j\n" };
# This will give you:
1
2
3
4
5
6
7
8
9
10
10
9
8
7
6
5
4
3
2
1

##</code><code>##


$pid = fork();
if (! $pid) {  ### This is the new process
   for ($j=10;$j>=0;$j--) { print "$j\n" };
} else {       ### This is the parent process
   for ($i=1;$i<=10;$i++) { print "$i\n" };
}

##</code><code>##

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