让Java ProcessBuilder环境持久化多个命令

ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.command("ls", "-l", ";", "pwd");

processBuilder.directory(new File("/home/user"));

Map<String, String> env = processBuilder.environment();
env.put("key", "value");

Process process = processBuilder.start();
InputStream inputStream = process.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

int exitValue = process.waitFor();
System.out.println("Exit Value: " + exitValue);