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  1. or download this
    my $line = <$INPUT_FH>;
$line = <$INPUT_FH>;
while ($line = <$INPUT_FH>) {
    # process file
}
  2. or download this
    while (my $line = <$INPUT_FH>) {
    # Ignore all lines not beginning with a number
...

    # process file
}
  3. or download this
    while (my $line = <$INPUT_FH>) {
    # Ignore the header lines
...

    # process file
}