You may want to take a look the Data::Table cpan module. It has a fromCSV method to create a Data::Table object from a csv file. Then, a specific column can be obtained with the subTable method. For example, 
use Data::Table;
my $t = Data::Table::fromCSV("aaa.csv");
my $c = $t->subTable(undef, ['MyColumnHeader']);
my $column_data_ref = $c->data;

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In reply to Re: Extract a column of csv by kevbot
in thread Extract a column of csv by Anonymous Monk

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