Dearest Monks,

I am trying to replace the text in file #1 with the text in file #2 to make file #3. I would like to do so based on the identity between the text in file #1 and the text before the underscore (_) in file #2 to make file #3. The basic idea is to be able to add the content after the underscore (which is indicated in file #2) into each entry of file #1, but I want to maintain the commas and line breaks found in file #1 so that it can be read into another program.

Here are smaller versions of my files:

File 1 (1.txt):

IIY86TY04J1FRV,IIY86TY04IIJKA,IIY86TY04JGLTI
IIY86TY04JH3LU
IIY86TY04I9BQV,IIY86TY04JEKGS,IIY86TY04JWBSL,IIY86TY04JUIVK
IIY86TY04JUW5G,IIY86TY04JAWV0
[download]

File 2 (2.txt):

IIY86TY04J1FRV_HG1
IIY86TY04IIJKA_HG3
IIY86TY04JGLTI_HG4
IIY86TY04JH3LU_HG1
IIY86TY04I9BQV_crop4
IIY86TY04JEKGS_HG1
IIY86TY04JWBSL_HG4
IIY86TY04JUIVK_HG4
IIY86TY04JUW5G_HG2
IIY86TY04JAWV0_HG3
[download]

I want to make File 3 (3.txt):

IIY86TY04J1FRV_HG1,IIY86TY04IIJKA_HG3,IIY86TY04JGLTI_HG4
IIY86TY04JH3LU_HG1
IIY86TY04I9BQV_crop4,IIY86TY04JEKGS_HG1,IIY86TY04JWBSL_HG4,IIY86TY04JU
+IVK_HG4
IIY86TY04JUW5G_HG2,IIY86TY04JAWV0_HG3
[download]

Based on a similar post, I thought I could do the following (please excuse my child-like annotations):

#!/usr/local/bin/perl

    use warnings;
    use strict;

    my $f1 = '1.txt'; # set up files 1 through 3
    my $f2 = '2.txt';
    my $f3 = '3.txt'; 

    my (@strings, $text);

    open (FH, $f1) || die;  # open file 1 in a file handle
    chomp(@strings = <FH>); # take off the line breaks

    open (FH, $f2) || die; # open file 2 in a file handle
    $text = join '', <FH>; # joins files 1 and 2? - I don't think I wa
+nt to do this...
    $text =~ s/\Q$_\E/$f3/g for @strings; # this is the problem spot, 
+I think...


    open (FH, ">$f3") || die;
    print FH $text;
    close FH;
[download]

but obviously not because when I do I get this for 3.txt:

IIY86TY04J1FRV_HG1
IIY86TY04IIJKA_HG3
IIY86TY04JGLTI_HG4
3.txt_HG1
IIY86TY04I9BQV_crop4
IIY86TY04JEKGS_HG1
IIY86TY04JWBSL_HG4
IIY86TY04JUIVK_HG4
IIY86TY04JUW5G_HG2
IIY86TY04JAWV0_HG3
[download]

Any ideas?

And many thanks in advance.

Vanessa

THANK YOU PERL MONKS!! YOU ARE AWESOME!!

Here is another version that works too. I also switched around the order of where the information after the underscore was placed in the output file...

  use warnings;
  use strict;

  my $f1 = '1.txt'; # file that needs the treatments added on
  my $f2 = '2.txt'; # file that has all of the treatments and an under
+score 
  my $f3 = '3.txt'; # output file

  my %ids;
  my $fh;

  open $fh, '<', $f2 or die;
  while (<$fh>) {
      chomp;
      my ($name, $id) = split /_/;
      $ids{$name} = $id;
  }
  close $fh;

  open my $fho, '>', $f3 or die;
  open $fh, '<', $f1 or die;

  while (<$fh>) {
      chomp;
      my @names = split /,/;
      foreach my $name (@names) {
          $name = $name . '_' . $ids{$name};
      }
      my $line = join(',', @names);
      print $fho $line, "\n";
  }

  close $fh;
  close $fho;
[download]

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