I did not understand your solution Actually the code till here is 
while (<MYINFILE>) { 
                    chomp ($_);
                    @line = split (/\t/, $_);
                    $rsfound = $line[11] ;
                    my$loc = $line[0] ;
                    if ($loc =~ m/location/i)
 {print OUTFILE "$_\t YRI_iHs\n" ; }
                    elsif ($rsfound =~ m/^rs[0-9]/i)
 {foreach my$key (keys(%out)) { 
                                        if ( $rsfound eq $key  )
 {print OUTFILE "$_\t $out{$key}\n";}
                                         
                                        }

[download]
This script show me only the line of file 2 where i find the match with the key of the hash %out. I actually need to print all the lines, even the ones without the match. Sorry from file 1 I go the hash %out with field1 as keys and field5 as values

In reply to Re^2: Add data to input files by micky744monk
in thread Add data to input files by micky744monk

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