In addition to kennethk's comment above, I would also recommend that you add a validity check to check(), something like (untested): 

sub check {

  my $ck = shift;

  my %message= (
    'y345'   => " Close ",
    '1223dx' => " Open ",
    '88888'  => " Gone ",
    'acb2'   => " Available ", 
    '1114'   => " Exit ",
    );

  return 'unknown or missing check value' 
    unless defined($ck) and exists $message{$ck};
  
  return $message{$ck};
  
  }

[download]
(Instead of returning an oddball message, you could die at that point.)

Also note that in the OPed code,  main() is called without arguments. As such, in the statement
    my $data = shift || return;
the value returned by shift will always be undefined, hence false, and  main() will always immediately return.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Return a hash value based on its key by AnomalousMonk
in thread Return a hash value based on its key by Anonymous Monk

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