使用帶有PS4設置的Java在調試模式下運行bash腳本

Question

我想使用帶有PS4環境變量集的Java在調試模式下運行bash腳本。

ProcessBuilder pb = new ProcessBuilder("/bin/bash" ,"-x", "/junk/leaptest.sh");
Map<String, String> env = pb.environment();
env.put("PS4", "${BASH_SOURCE}:::${LINENO}:::COV:");
final Process process = pb.start();
BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
PrintWriter pw = new PrintWriter(process.getOutputStream());
String line;
while ((line = br.readLine()) != null) {
    System.out.println("line no--->>" + line);
    pw.println("2000");
    pw.flush();
}

輸出的是我得到的輸出，因為它未在調試模式下運行並且未設置我的PS4 env

當我使用運行時命令時，同樣的事情起作用，

String[] cmd = new String[3];
cmd[0] = "/bin/bash"; // should exist on all POSIX systems
cmd[1] = "-xv";
cmd[2] = args[0];

String[] env = new String[1];
env [0] = "PS4=${BASH_SOURCE}:::${LINENO}::: COV:";
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0]  + cmd[1]);

Process proc = rt.exec(cmd,env);

Answer 1

當bash使用-x運行時，它將跟蹤信息寫入標准錯誤，而不是標准輸出。 您需要使用類似以下內容來捕獲它：

PrintWriter pwe = new PrintWriter(process.getErrorStream());