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Using Apache commons-exec to get process output

I couldn't find a good example of this, so here's how you use a PumpStreamHandler from commons-exec from the apache 

public static void main(String a[]) throws Exception
        {
            ByteArrayOutputStream stdout = new ByteArrayOutputStream();
            PumpStreamHandler psh = new PumpStreamHandler(stdout);
            CommandLine cl = CommandLine.parse("ls -al");
            DefaultExecutor exec = new DefaultExecutor();
            exec.setStreamHandler(psh);
            exec.execute(cl);
            System.out.println(stdout.toString());
        }