Dear Monks, I just started with perl and seek your advice. I have one large pipe '|' separated text file with many columns. I have another small text file with only one column. I need to write out or extract only those records (lines) from the large file, to a new file, if the value in column 1 matches with the value in column 1 of the smaller file. Here is my code and I am sure it is faulty and so seek your advice :) it is actually returning all lines from File1.txt. But what I need is only those lines where column 1 data is matching. Thanks in advance. 

#!c:\perl\bin\perl


# Set file paths
$FILE1 = "D\:\\Data\\WES\\File1.txt";
$FILE2 = "D\:\\Data\\WES\\File2.txt";
$FILE3 = "D\:\\Data\\WES\\File3.txt";

# print "$FILE1\n";
# print "$FILE2\n";
# print "$FILE3\n";

my %F1hash;

open(F1,'<', $FILE1) or die "Can't open $FILE1\n";
open(F2,'<', $FILE2) or die "Can't open $FILE2\n";
open(F3,'>', $FILE3) or die "Can't open $FILE3\n";

print F3 "\n";
# print LOGFILE "$start_date \n";
print F3 "===========================================\n";
print F3 "The following Partnumbers have been synchronized\n";
print F3 "===========================================\n";
print F3 "\n";


my %F1hash = ();

while (<F2>) {
    $ptfkey = $_;
    $ptfpn = $ptfkey;
    $ptfpn =~ s/^\s+|\s+$//g;
    $F1hash{$ptfkey, $ptfpn} = $ptfpn;
    }
    
close F2;

while (<F1>) {
          #chomp;
          $uline = $_;
          @ufields = split(/\|/, $uline);
          # print "$ufields";
                  $PartNumber = $ufields[0];
        $Std_Cost = $ufields[1];
        $Last_Paid_Price = $ufields[2];
        $Qty_In_Stock = $ufields[3];
        $Moto_Preferred_Part = $ufields[7];
        $Rev = $ufields[9];
        $Agile_Description = $ufields[10];
        if ($PartNumber =~ $Flhash{$PartNumber}) {
        #print "$ufields[0] \n";   
                print F3 "$PartNumber|$Std_Cost|$Last_Paid_Price|$Qty_
+In_Stock|$Moto_Preferred_Part|$Rev|$Agile_Description\n";

                
        }
    }
    
    
close F1;
close F3;

exit;

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In reply to Question on file compare by sureshsmr

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