In the following code when the command ls -a is executed why is that i see only the list of directories and not any files that are on a remote linux server

              JSch jsch = new JSch();
              Session session = jsch.getSession(username1, ip1, 22);
               java.util.Properties config = new java.util.Properties();
               config.put("StrictHostKeyChecking", "no");
               session.setConfig(config);
               //session.setPassword(password.getText().toString());
               session.setPassword(password1);

               session.connect();
               final ListView mainlist   = (ListView)findViewById(R.id.list);
               final RelativeLayout rl   = (RelativeLayout)findViewById(R.id.rl);
              mainlist.setVisibility(View.VISIBLE);
              rl.setVisibility(View.INVISIBLE);

               String command = "ls -a";
               Channel channel = session.openChannel("exec");
               ((ChannelExec) channel).setCommand(command);
               channel.setInputStream(null);
               ((ChannelExec) channel).setErrStream(System.err);
               InputStream in = channel.getInputStream();