if you know what keys are allowed you can check for ones that are not allowed 

my %allowed = map ( $_ => 1 } qw/ name user host command/; 

for my $cmd (@commands) {
  my $badkeys=''; 
  for my $key (keys %$cmd) { 
    unless ($allowed {$key) {$badkeys.=' '.$k} 
    } 
  if ($badkeys) { 
    print 'skipping due to badkeys found:'.$badkeys."\n"; 
    next; 
    } 
  if ($state->{status} eq 'success') {
...

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In reply to Re: How best to validate the keys of hashref arguments? by huck
in thread How best to validate the keys of hashref arguments? by cbeckley

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