I have the first part of the task completed i.e. sorting the files. Here is my code 
///My code
use FileCache maxOpen => 1000;
////////////
# config:
my $field = 0;
my $sep = ",";

////MY code
cacheout $mode, $path;
$fh = cacheout $mode, $path;
/////////


$, = $sep;
$\ = $/;


my %file; # { num, name, $fh }

my $fnum = 1;


while (<>)
{
    chomp;
    my @c = split /$sep/o;

    my( $key, $num ) = defined $c[$field]
        ? ( $c[$field], $fnum++ )
        : ( '(column not present)', 0 );
    
        
    
    unless ( $file{$key})
    {
        $nameF = $c[$field];
        $nameF =~ s/"//g; 
    
        $file{$key}{num} = $num;
        $file{$key}{name} = "out/".$nameF.$ARGV[0];
        if(($file{$key}{num}) >1){
        -f $file{$key}{name} and die
            "Sorry, '$file{$key}{name}' exists; won't clobber."; 
        open $file{$key}{fh}, ">", $file{$key}{name} or die
            "Error opening '$file{$key}{name}' for write - $!";
    }}

    print {$file{$key}{fh}} @c;
}

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The problem is the filecache. I am not familiar with perl so I am having problems with this part of code.
I am getting error $ perl split.pl Input.csv .cvs Error opening '4444.cvs' for write - Too many open files at split.pl 39, <> line 817961.
I have marked the my addition to jdporter's code
I don't know $path and $mode are.

In reply to Re^4: part - split up files according to column value by mick2020
in thread part - split up files according to column value by Corion

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