gistfile1.txt

public static String exec(String command) {
        try {
            Process p1 = Runtime.getRuntime().exec(command);
            p1.waitFor();
            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(p1.getInputStream()));
            StringBuilder sb = new StringBuilder();
            StringBuilder sb2 = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line).append("\n");
            }
            reader = new BufferedReader(new InputStreamReader(p1.getErrorStream()));

            while ((line = reader.readLine()) != null) {
                sb2.append(line).append("\n");
            }
            return sb.toString() + sb2.toString();
        } catch (IOException | InterruptedException e) {
            Log.w(e);
            return e.getMessage();
        }

    }