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@HeaderRecordNames   = qw/$RequestYear $RequestMonth $RequestDay $Requ
+estSequence $RecordType $RecordSequence $Record/;
@HeaderRecordLengths = qw/A2           A2            A2          A4   
+            A2          A2              A1486/;
...

my (@HeaderRecordNames) = unpack(@HeaderRecordLengths, $_);
my (@RecordNames[$Recordtype])=unpack(@RecordLengths[$RecordType]);

@HeaderRecordNames   = qw/RequestYear RequestMonth RequestDay RequestS
+equence RecordType RecordSequence Record/;
$HeaderRecordLengths = q/A2A2A2A4A2A2A1486/;
...
my %Header = map {$HeaderRecordNames[$_] => $head[$_]} (0..$#head);
my @data = unpack($RecordLengths[$head{RecordType}], $Header{Record});
my %Record = map {$RecordNames[$_] => $data[$_]} (0..$#data);