I used UNIX to join 2 files based on the first column, but now i want to use it on windows, so UNIX won't work anymore. I wrote a script to do it in Perl, but this takes for ever. I read something about hashes and that it should be faster this way. Could somebody help me with this? The two files have a different nr of columns and rows and when column 1 is equal the two files should be merged. The files are tab separated. What I did in Unix was just sort the files and join. My code in Perl looks like this: 

my $file1 = $ARGV[0];
my $file2 = $ARGV[1];

open(first_file,'<', $file1) or die $!;
my @FILE1 = <first_file>;
close(first_file);

open(sec_file,'<', $file2) or die $!;
my @FILE2 = <sec_file>;
close(sec_file);

@RESULTS;

for my $line(@FILE1){
        my($ID, @values) = split("\t", $line);

        for my $sec_line(@FILE2){
                my($ID2, @values2) = split("\t", $sec_line);
                

                if($ID eq $ID2){
                        push (@RESULTS, "$ID    @values @values2");

                }
        }
}

open(RESULTS,'>','results.txt') or die $!;
foreach(@results){
   print RESULTS "$_\n";
}
close(RESULTS);

[download]
Could somebody help me do this on a faster way? Thanks!

In reply to Join files using perl by linseyr

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