exec.java

private static boolean isWindows() {
    return System.getProperties().getProperty("os.name").contains("Windows");
}

public static String exec(String command, long timeout) {
    Process ps;
    try {
        if(isWindows()) {
            ps = Runtime.getRuntime().exec("cmd.exe /C " + command);
        } else {
            ps = Runtime.getRuntime().exec(new String[]{"/bin/bash", "-cl", command});
        }
    } catch (IOException e) {
        Logger.e("runtime.exec failed", e);
        return null;
    }

    boolean stopped = false;
    try {
        stopped = ps.waitFor(timeout, TimeUnit.SECONDS);
    } catch (InterruptedException e) {
        Logger.e("ps.waitFor interrupted", e);
    }

    if (!stopped) {
        return null;
    }

    BufferedReader br = new BufferedReader(new InputStreamReader(ps.getInputStream()));
    StringBuilder builder = new StringBuilder();
    String line;
    try {
        while ((line = br.readLine()) != null) {
            builder.append(line);
            builder.append(Config.LINE_SEPARATOR);
        }
    } catch (IOException e) {
        Logger.e("br.readLine failed", e);
        return null;
    }

    return builder.toString();
}