Hi Marshall,

Thanks for the code. I did changed the code a bit to make it work. Now, I am getting the correct output file. 


while (my $row = $csv->getline($FILE1)) 
{
                        # $row is a reference to a row
    my @fields = @$row; # this explicitly de-references
    my $id1 = $fields[1];
    
    if (exists $file2{$id1})
    {
    my $fields_ref=  \@fields;
    unshift(@$fields_ref, "HK");
    $csv->print ($FILE3, $fields_ref);
       # $csv->print ($FILE3, "HK", @fields); #both files
    }
    else
    {
    my $fields_ref = \@fields;
    unshift (@$fields_ref, "NOT_HK");
    $csv->print ($FILE3, $fields_ref);
    }
  }

[download]

In reply to Re^2: Matching two files based on one column common in each by bluray
in thread Matching two files based on one column common in each by bluray

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.