in reply to how to traverse thru this hash?

Assuming the hash is named %instructions: 
for my $computer (keys %instructions) {
  my $commands = $instructions{$computer};
  for my $comm (keys %$commands) {
    my $argument_sets = $commands->{$comm};
    for my $args (@$argument_sets) {
      my @values = @$args;
      print "$computer: $comm: [@values]\n";
    }
  }
}

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That should print 
comp1: cmd2: [test2 type1 view1]
comp1: cmd1: [test1 type1 view1]
comp1: cmd1: [test2 type1 view1]

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unless I made a mistake. The code is untested but looks ok to me.
Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

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Re^2: how to traverse thru this hash?
by kwaping (Priest) on Nov 03, 2005 at 22:46 UTC
    Is there any benefit to using "for" instead of "foreach", or is it just a style thing?
[reply]
      My fingers are saved some work? Honestly, 'for' and 'foreach' are interchangeable in Perl syntax. Just read perlsyn.
      Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
      How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart
[reply]
        Thanks for that link. Interestingly enough, at the bottom of the foreach section in that document, this is written:

        And it's faster because Perl executes a foreach statement more rapidly than it would the equivalent for loop.

        So you might want to consider typing those four extra letters. :)
[reply]

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