Not one of the answers addresses the problem with using <> for reading CSV lines that might have embedden newlines

use strict;
use warnings;
use Text::CSV_XS;

my %hash;
my $csv = Text::CSV_XS->new ({binary => 1, eol => "\n"});
open my $io, "<", "file.csv" or die "file.csv: $!";
my @fld = @{$csv->getline ($io)};
while (my $row = $csv->getline ($io)) {
    push @{$hash{$fld[$_]}}, $row->[$_] for 0 .. $#fld;
    }
close $io;
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