How to run a terminal command and print the output through java in Mac

Question

I tried below code to get the output of the ran command. But it printing empty.

String cmd = "/bin/bash device_id -l";
Process process = Runtime.getRuntime.exec(cmd);
BufferedReader reader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}
reader.close();

Could anyone please help me. I have to get the connected iDevice UDID.

I don't know what does your command do, but I tried String cmd = "ps -ef"; and got output in stdout. Maybe your command writes in stderr? — jctim
– jctim, Commented Nov 3, 2015 at 12:17

Shiva Krishna Chippa · Accepted Answer · 2015-12-27 09:20:58Z

1

With the below code I could get the connected device udid.

public String deviceUDID() throws IOException{
        ProcessBuilder builder = new ProcessBuilder("/bin/bash", "-c", "/usr/local/bin/idevice_id -l");
        builder.redirectErrorStream(true);
        Process p = builder.start();
        BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        line = r.readLine();
        System.out.println(line);
        return line;
    }

edited Dec 27, 2015 at 9:20

answered Nov 26, 2015 at 12:08

Shiva Krishna Chippa

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