private void testStartClientOnUnix(String suffix, String os) throws IOException {
    String dir = getServerPath();
    final String output =
        "If you want to change this configuration, please check conf/datanode-env.sh.";
    String cmd = dir + File.separator + "conf" + File.separator + "datanode-env" + suffix;
    ProcessBuilder builder = new ProcessBuilder("bash", cmd);
    testOutput(cmd, suffix, builder, output, os);
  }
This test case is strange that it relies on the maven output files
iotdb-core/datanode/src/test/java/org/apache/iotdb/db/script/EnvScriptIT.java