I have a input file with contents as below: 

<mt>llbreserve_Stov1</mt>
      <mt>llbreserve_Stov2</mt>
      <mt>preserve_Stov1</mt>
      <mt>qreserve_Stov1</mt>
      <mt>qreserve_Stov2</mt>
      <mt>mnreserve_Stov1</mt>
      <mt>slmreserve_Stov1</mt>
      <mt>slmreserve_Stov2</mt>
      <mt>envreserve_Stov1</mt>
      <mt>envreserve_Stov2</mt>
      
      <mv>
<value>MT=DUOSQ2,Eb=43789,Fc=67890</value>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        </mv>

[download]

I have written the code(pasting here only the specific code,not all lines)as below: 

# Writing output from mt step until mv for reserve meas only
                    $dimens=scalar(keys(%ind));
                    for ($jj=1; $jj <= $dimens; $jj++)
                    {
                        # Writing output mt reserve meas list
                        print OUTFILE "<mt>$kpi[$jj]<\/mt>\n";
                    }
                    foreach $value (keys %result)
                    {
                        foreach $ext (keys %{$result{$value}})
                        {
                            print OUTFILE "<mv>\n";
                            print OUTFILE "$value".",resv="."$ext<\/va
+lue>\n";
                            for ($jk=1; $jk <= $dimens; $jk++)
                            {
                                # Writing output r meas list result so
+rted in the same order than mt list
                                print OUTFILE "$result{$value}{$ext}{$
+kpi[$jk]}\n";
                            }
                            print OUTFILE "<\/mv>\n";
                        }
                    }
                    print OUTFILE "$line\n";

[download]

The output file which i get after executing the code is 

      <mt>llbreserve</mt>
      <mt>preserve</mt>
      <mt>qreserve</mt>
      <mt>mnreserve</mt>
      <mt>slmreserve</mt>
      <mt>envreserve</mt>
  <mv>
<value>MT=DUOSQ2,Eb=43789,Fc=67890,resv=Stov1</value>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
        <r>0</r>
</mv>
<mv>
<value>MT=DUOSQ2,Eb=43789,Fc=67890,resv=Stov2</value>
                <r>0</r>

        <r>0</r>
        
        <r>0</r>
        <r>0</r>

[download]

I can see that there are some blank lines where the combination is not present(Stov1 is present for all meas whereas Stov2 is not present for all.)I am planning to insert a tag like <r></r> in place of blank lines so that further processing of my outputfile is valid. Could you pl. help me to achieve this.TIA

In reply to Perl code to format the text file by inserting tag in blank line by DAN0207

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