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REVIEW_DATE,AUTHOR,ISBN,DISCOUNTED_PRICE
1985/01/21,"Douglas Adams",0345391802,5.95
...
2003/09/30,"Scott Adams",0740721909,4.95
2004/10/04,"Benjamin Radcliff",0804818088,4.95
2004/10/04,"Randel Helms",0879755725,4.50

use strict;
use warnings;
...
open $csvfh, '>', "sorted_$csvFileName" or die $!;
$csv->print( $csvfh, $_ ) for @csvLines;
close $csvfh;

REVIEW_DATE,AUTHOR,ISBN,DISCOUNTED_PRICE
2004/10/04,"Randel Helms",0879755725,4.50
...
2002/06/23,"David Jones",0198504691,9.95
2002/06/23,"Julian Jaynes",0618057072,12.50
1998/07/15,"Timothy ""The Parser"" Campbell",0968411304,18.99

{ $a->[3] <=> $b->[3] }

{ $a->[5] <=> $b->[5] }