String cmd = "";
        final Map<String, String> params = new HashMap<String, String>();
        List<String> list = extractor.parseCommand(cmd, params);
        assertEquals(0, list.size());

        cmd = "test.sh";
        params.clear();
        list = extractor.parseCommand(cmd, params);
        assertEquals(1, list.size());
        assertEquals("test.sh", list.get(0));

        params.put("$INPUT_FILE", inputFile.getAbsolutePath());
        params.put("$OUTPUT_FILE", outputFile.getAbsolutePath());

        final List<String> cmdList = parseCommand(command, params);
        if (logger.isInfoEnabled()) {
            logger.info("Command: {}", cmdList);
        }

        final ProcessBuilder pb = new ProcessBuilder(cmdList);