It is highly recommended that you use a module such as Text::xSV or Text::CSV to read CSV files. They are much tricker than they seem! If the file is very large you might think about using DBI and DBD::CSV to treat the file as a database.
Note that:
my %thisrecord = map { $columns[$_] => $fields[$_] } ( 0 .. $#fiel
+ds );
can be done using a slice:
@thisrecord{@columns} = @fields;
Where you go after that depends on what you want to achieve. You may want something like:
for my $items (sort {$b->{Estimated_Value} <=> $a->{Estimated_Value}}
+@data) {
...
}
DWIM is Perl's answer to Gödel
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