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    <p>Based on my understanding, here are two possible methods. The first one uses composite keys to store values in a single level hash. The second one uses a multi-level hash:</p> <p><strong>Method 1:</strong></p> <pre><code>#!/usr/bin/perl use strict; use warnings; use List::Util qw( sum ); my %data; while ( my $line = &lt;DATA&gt; ) { chomp $line; my @parts = split /, /, $line; last unless @parts; my $value = pop @parts; push @{ $data{$_} }, $value for @parts; } for my $col ( sort keys %data ) { printf("%12s:%9d\n", $col, sum @{ $data{$col} } ); } __DATA__ 3=5002, 0=10002, 5=1, 4=1, 7=1, 8=1, 9=0, 1=14002, 6=5, 200 3=5002, 0=10002, 5=0, 4=1, 7=0, 8=0, 9=1, 1=14002, 6=5, 300 3=5001, 0=10001, 5=0, 4=0, 7=0, 8=0, 9=0, 1=14001, 6=3, 1000 3=5001, 0=10004, 5=1, 4=1, 7=2, 8=2, 9=1, 1=14001, 6=3, 10000 3=5003, 0=10004, 5=2, 4=0, 7=2, 8=2, 9=1, 1=14003, 6=8, 5000 3=5003, 0=10004, 5=3, 4=1, 7=2, 8=1, 9=0, 1=14003, 6=8, 1000 C:\Temp&gt; hj 3=5001: 11000 3=5002: 500 3=5003: 6000 0=10001: 1000 0=10002: 500 0=10004: 16000 1=14001: 11000 1=14002: 500 1=14003: 6000 4=0: 6000 4=1: 11500 5=0: 1300 5=1: 10200 5=2: 5000 5=3: 1000 6=3: 11000 6=5: 500 6=8: 6000 7=0: 1300 7=1: 200 7=2: 16000 8=0: 1300 8=1: 1200 8=2: 15000 9=0: 2200 9=1: 15300 </code></pre> <p><strong>Method: 2</strong></p> <pre><code>#!/usr/bin/perl use strict; use warnings; use List::Util qw( sum ); my %data; while ( my $line = &lt;DATA&gt; ) { chomp $line; my @parts = split /, /, $line; last unless @parts; my $value = $parts[-1]; for ( my $i = 0 ; $i &lt; @parts - 2; ++$i ) { my @subparts = split /=/, $parts[$i]; push @{ $data{$subparts[0]}-&gt;{$subparts[1]} }, $value; } } for my $k1 ( keys %data ) { for my $k2 ( keys %{ $data{$k1} } ) { printf( "%2d:%6d:%9d \n", $k1, $k2, sum @{ $data{$k1}-&gt;{$k2} } ); } } __DATA__ 3=5002, 0=10002, 5=1, 4=1, 7=1, 8=1, 9=0, 1=14002, 6=5, 200 3=5002, 0=10002, 5=0, 4=1, 7=0, 8=0, 9=1, 1=14002, 6=5, 300 3=5001, 0=10001, 5=0, 4=0, 7=0, 8=0, 9=0, 1=14001, 6=3, 1000 3=5001, 0=10004, 5=1, 4=1, 7=2, 8=2, 9=1, 1=14001, 6=3, 10000 3=5003, 0=10004, 5=2, 4=0, 7=2, 8=2, 9=1, 1=14003, 6=8, 5000 3=5003, 0=10004, 5=3, 4=1, 7=2, 8=1, 9=0, 1=14003, 6=8, 1000 C:\Temp&gt; hjk 3: 5003: 6000 3: 5002: 500 3: 5001: 11000 7: 1: 200 7: 0: 1300 7: 2: 16000 9: 1: 15300 9: 0: 2200 8: 1: 1200 8: 0: 1300 8: 2: 15000 4: 1: 11500 4: 0: 6000 1: 14001: 11000 1: 14003: 6000 1: 14002: 500 0: 10001: 1000 0: 10004: 16000 0: 10002: 500 5: 1: 10200 5: 3: 1000 5: 0: 1300 5: 2: 5000 </code></pre> <p><strong>NB:</strong> Add <code>sort</code> to taste.</p>
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    1. USSinan Ünür
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    1. COJust wondering why you are using the shebang `#!/usr/bin/perl` under Windows, Sinan.
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      1. USAlan Haggai Alavi
    2. CO@Alan because Windows does not pay attention to the interpreter path but I can still specify flags on the shebang line. By keeping it a relatively standard `/usr/bin/perl`, I can run the same script in cmd.exe using ActiveState or Strawberry perl or Cygwin perl in the Bash shell or in ArchLinux on those occasions when I dual boot. Finally, I can upload and test the script to any other *nix machine I have access to without having to make changes.
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    3. CO@Sinan, I see. Nice idea. Using Arch Linux too. :-)
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