I have to run a report from 2 csv files, i am stuck on the part where i want to keep only unique elements from column B, deleting any duplicates but displaying the count of how many duplicates there were. then i wish to reference this array in the 2nd csv file, is that possible? sample of data 
input           output
james           james 2
dave           dave    2
mike           mike    3
ken           ken    3
jon           jon    5
jon            
ken            
jon            
mike            
james            
dave            
mike            
ken            
jon            
jon

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The code i have so far. I can keep only unique elements but am stuck on how to show duplicate count. 
#!/usr/bin/perl
use strict;
use warnings;
use Tk;
use Tk::BrowseEntry;
use POSIX 'mktime';
use POSIX 'strftime';
open(STDERR, ">&STDOUT");

   ########  entry widget to get $yyyy $mmm $dd   ####################
+###################

print "\n    Select Year            = $yyyy\n";
print "\n    Select Month        = $mmm\n";
print "\n    Number of Backup Days    = $dd\n";

     ########     create  input and output files    ##################
+#####################

my $filerror = "\n\n! Cannot open File below, please check it exists o
+r is not open already?\n"; 
my $OUTFILE = "C:\\Temp\\$yyyy\$mmmAudit.txt";
my $INFILE1 = "c:\\$yyyy\\$mmm\\report.csv";
my $INFILE = "c:\\$yyyy\\$mmm\\names.csv";
#Open input file for reading and Output file for writting
open (INPUT,"$INFILE") or die "\n$filerror\$INFILE",,1;
#open (OUTPUT,">$OUTFILE") or die "\n$filerror\n$OUTFILE",,1; 

my $total_names = 0;
$total_names++ while (<INPUT>);
my $Month_total = $total_names * $dd;
     #########   get total number of rows in files   #################
+#################
print "\n    Total number of names is $total_names\n";
print "\n    Total number of names is $Month_total\n";
close INPUT;
open (INPUT,"$INFILE") or die "\n$filerror\$INFILE",,1;
     #########   keep only unique names and display number count of du
+plactes #########
my %seen;
while (<INPUT>)
{
    chomp;
    my $line = $_;
    my @elements = split (",", $line);
    my $col_name = $elements[1];
    print "    $col_name  \n" if ! $seen{$col_name}++;
}

close INPUT;

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In reply to keep only unique elements in an array displaying number of duplcates. by john.tm

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