You don't need to write your own sort for this one.
Data::Table does this for you.
#!/usr/bin/perl
use strict;
use Data::Table;
my $t = Data::Table::fromCSV("data.csv", 0); # No header
$t->sort(8,0,0, 0,1,0, 4,0,1, 2,0,1, 1,0,0);
print $t->csv;
The parameters on the sort specify the column,
sort direction, and numeric versus ascii sorting.
This produces output that agrees with yours.
It should work perfectly the first time! - toma
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