my @cmd_mtime_file_bmw = (
        qw( ssh -T -l ),
        $xx_user,
        $xx_host,
        qw ( "stat (" ),
        $actual_a3db_xx_pfad[$k],
        qw ( ")" ),
        qw ([9] ),
);

$mtime_file_xx = system( @cmd_mtime_file_xx );