gistfile1.java

	Writer w = SUFS.writeFile("/data/tempfile");
	try {
	    w.stream.writeChars("A\nB\nC\n");
	} catch (IOException e) {
	    e.printStackTrace();
	}
	w.finish();


public final class SUFS  {

...
 public static Writer writeFile(String file) {
	try {
	    Process p = Runtime.getRuntime().exec("su");
	    DataOutputStream sw = new DataOutputStream(p.getOutputStream());
	    sw.writeBytes("tee " + file + "\nexit\n");
	    sw.flush();
	    Writer w = new Writer();
	    w.proc = p;
	    w.stream = sw;
	    return w;
	} catch (Throwable t) {
	    t.printStackTrace();
	}
	return null;
    }

    public static class Writer {
	public DataOutputStream stream;
	private Process proc;
 
	public void finish() {
	    try {
		stream.close();
		proc.waitFor();
	    } catch (Exception e) {
		e.printStackTrace(); 
	    }
	}
    }

...
}