if (cmd != null && cmd.length() > 0) {
channel = sshSession.createChannel("exec", cmd);
channel.setIn(new ByteArrayInputStream(new byte[0]));
} else {
channel = sshSession.createChannel("shell");
channel.setIn(new NoCloseInputStream(System.in));
((ChannelShell) channel).setPtyColumns(ShellUtils.getTermWidth(session));
((ChannelShell) channel).setupSensibleDefaultPty();
((ChannelShell) channel).setAgentForwarding(true);
}
channel.setOut(new NoCloseOutputStream(System.out));