Your code should work, except that you need to replace:

%cmd_table{$test}
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by

$cmd_table{$test}
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You are refering to the value of a hash entry, not the hash itself, that's why you need $.

Oh, and there is no need for the @testarray (at least not in this snippet): just loop over the keys of %cmd_table, as in:

foreach $test (keys %cmd_hash) {
  # do your thing
}
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Hope this helps.

CU
Robartes-