index = `cat /tmp/myfile.index`
$index = $index + 1
echo $index > /tmp/myfile.index
exit 0
[download]

In Perl you would write that as:

$index = `cat /tmp/myfile.index`;
$index = $index + 1;
system "echo $index > /tmp/myfile.index";
exit 0;
[download]

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