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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);
Could somebody help me do this on a faster way? Thanks!

In reply to Join files using perl by linseyr

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