To associate more than one value with a hash key you need an advanced data structure, a hash of anonymous arrays, here is one way to do that, I am reading the data from two files, File1.txt and File2.txt: 
#!/usr/local/bin/perl
use strict;
use warnings;
open (FH1, "File1.txt")or die("Error opening File1 $!\n");
my %hash1;
while(<FH1>){
            next if /(trip|valu1|valu2)/;          #skip the header
            my ($key, $val1, $val2)= split /\s+/;
            push @{$hash1{$key}}, ($val1, $val2);   #hash of anonymous
+ array
            }
close FH1;

open(FH2, "File2.txt")or die("Error opening File1 $!\n");
my %hash2;
while(<FH2>){
             next if /(trip|value)/;
             my($key, $val3)=split /\s+/;
             $hash2{$key}=$val3;
             }
close FH2;


#convey common keys into one hash..
my %hash3;
my ($key1, $key2);
foreach $key1(keys %hash1){
        foreach $key2(keys %hash2){
                if ($key2 eq $key1){
                   push @{$hash3{$key1}}, @{$hash1{$key1}}, $hash2{$ke
+y2};
                   }
                }
        }

#Print to STDOUT
print "TRIP\tvalue1\tvalue2\tvalue3\n"; 
foreach my $key(keys %hash3){
        print "$key\t";
        print "@{$hash3{$key}}\n";
        }

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UPDATE: Perlref and Perlreftut are additional must-reads, to be able to manipulate the data structures you need to have an idea on references and how to dereference them..>

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In reply to Re: Hash w/ multiple values + merging by biohisham
in thread Hash w/ multiple values + merging by sophix

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