My requirement is to read all.csv files in the format groupid_groupname.csv in a folder. Secondly after reading create two new columns with groupid & groupname and print the constant value fetched above. I have written the code but while using just print it works perfect and shows exact result but when writing to csv file..it goes for a toss. Please advice 
use strict;
use warnings;
use Text::CSV;
use Text::CSV_XS;
use autodie;

print_Filenames_directory();


sub print_Filenames_directory
{
my @files = <*.csv>;
    foreach my $file (@files)
    {
        open my $in, "+<:encoding(utf8)", $file or die $!;
        
        my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1 });
                                
        my @name = split _,$file;
        my $grpid = $name[0];
        my $grpname = substr($name[1], 0,-4);
        
        
        my @headers; 
    
        while (my $row = $csv->getline($in)) 
        {      
             if($.==1) 
            {
               # Add value to @columns array
               splice @$row, 0, 0, "Group ID";
               splice @$row, 1, 0, "Group Name";                
               @headers = "@$row\n";
               print  "@headers";
               #$csv->print(@headers); 
            } 
            else
            {
               splice @$row, 0, 0, $grpid;
               splice @$row, 1, 1, $grpname;                
               print "@$row\n"; 
               #$csv->print($in, @$row);                              
+              
            }   
                               
        }
        # check for errors
        $csv->eof or $csv->error_diag();
            
        close $in;
    }

}

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In reply to Inserting new column by Avi_Perl_Beginner

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