If I understand correctly, what you need is a PIVOT. Here is a way to do so:
$ cat pivot.pl
#!/pro/bin/perl
use strict;
use warnings;
use Text::CSV_XS;
use Spreadsheet::Read;
my $ss = ReadData (shift)->[1];
my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1, eol => "\r
+\n" });
$csv->print (*STDOUT, [@{$ss->{cell}[$_]}[1..$ss->{maxrow}]]) for 1 ..
+ $ss->{maxcol};
$ cat test.csv
a,b,c,d,e,f
1,2,3,4,5,6
2,3,4,5,6,7
3,4,5,6,7,8
4,5,6,7,8,9
$ perl pivot.pl test.csv
a,1,2,3,4
b,2,3,4,5
c,3,4,5,6
d,4,5,6,7
e,5,6,7,8
f,6,7,8,9
$
Enjoy, Have FUN! H.Merijn
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