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  1. or download this
    if (!$line || $!) {
  2. or download this
    if (open(FH, $filename)) {
    # Here $! is meaningless.
...
}
# Since here we might have either success or failure,
# here $! is meaningless.
  3. or download this
    my $isOpen = open($handle, $templateLocation) or die "foo: $!";