This will probably shorten the running time but I don't have your data to test it on, so good luck.
#!/usr/bin/perl
use warnings;
use strict;
use Fcntl ':seek';
open my $CSV, '<', 'donor_82_01.csv' or die "Cannot open 'donor_82_01.
+csv' because: $!";
my $pos = tell $CSV;
my %csv_data;
while ( <$CSV> ) {
my ( $first ) = split /,+/;
push @{ $csv_data{ $first } }, $pos;
$pos = tell $CSV;
}
open my $TAB, '<', 'tmp12' or die "Cannot open 'tmp12' because: $!";
open my $OUT, '>', 'tmp12_02' or die "Cannot open 'tmp12_02' because:
+$!";
while ( <$TAB> ) {
my ( $first, $second ) = split /\t+/;
next unless exists $csv_data{ $second };
for my $pos ( @{ $csv_data{ $second } } ) {
seek $CSV, $pos, SEEK_SET or die "Cannot seek on 'dono
+r_82_01.csv' because: $!";
print $OUT "$first,", scalar <$CSV>;
}
}
close $CSV;
close $TAB;
close $OUT;
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