Consider this:
#!/usr/bin/perl -w
use strict;
my $FILE1 = <<END;
ID1 50
ID2 60
ID3 100
END
my $FILE2 = <<END;
ID1 20
ID2 100
ID3 10
END
my %ids;
foreach my $file (\$FILE1, \$FILE2) #just put path name of
#FILE1 and FILE2 here.
#This ref is special because of
#putting the file contents within
#the code.
#FILE1 and 2 are "hereis" docs.
{
open (FILE, "<", $file) or die "unable to open $file for read $!";
while (<FILE>)
{
chomp; # delete trailing \n
# here I split on one or more space characters,
# A tab char doesn't show up well on this forum's text
my ($id, $value) = split (/\s+/, $_);
push @{$ids{$id}}, $value;
}
}
#Each key of the hash of %ids contains a reference to
#an array of id's. This is called a HoA - Hash of Array
foreach my $id (sort keys %ids)
{
print "$id @{$ids{$id}}\n";
}
#This code will run very fast because each line is
#only read one time - Input/Output (I/O) is very
#"expensive"
__END__
OUTPUT:
ID1 50 20
ID2 60 100
ID3 100 10
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