Then I'm afraid I have bad news - you cannot do what you're trying to do, the way you're trying to do it. A module is 'static' code - it's imported by your subs when you start them, but it doesn't have any persistent state.

You may wish to consider reading from a file. At the most basic this goes like (and please note - this is very basic, there's no error or integrity checking):

{ 
  my $state_file = "current_masterid.txt";
  my $MASTERLOGFILE;
  my $MASTERID;
  sub save_masterid
  {
    if ( defined $MASTERID ) 
    {
      open ( my $output_fh, ">", $state_file );
      print $output_fh $masterid;
      close ( $output_fh );
    }
  }
  
  sub load_masterid
  {
    if ( -f $state_file )
    {
      open ( my $input_fh, "<", $state_file );
      $MASTERID = <$input_fh>;
      close ( $input_fh );
    }
    else
    {
      $MASTERID = "00000000";
      $MASTERLOGFILE = "LOGFILE not defined";
      &save_masterid()
    }
  }
  
  sub get_masterid 
  {
    &load_masterid() unless defined $MASTERID;
    return $MASTERID;
  }
  
  sub set_masterid
  {
    ( $MASTERID ) = @_;
    &save_masterid();
  }
}
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