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  open( my $fh, "<", $sigDataFile ) || die( "cannot open file - $!" );
  while( <$fh> ) {
...
     my( $key, $value ) = split(/=/, $_); # does = need to be escaped?
     ...
   }

  use Fcntl;
  use SDBM_File;
...
    $hash{$key} = $value;
    ...
  }