Executing multiple commands using j2ssh - command

Question

I would like to know how to execute multiple commands using j2ssh. The code I got from the net is as follows:
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import com.sshtools.j2ssh.io.IOStreamConnector;
import com.sshtools.j2ssh.io.IOStreamConnectorState;
import com.sshtools.j2ssh.connection.*;
import com.sshtools.j2ssh.SshClient;
import com.sshtools.j2ssh.authentication.PasswordAuthenticationClient;
import com.sshtools.j2ssh.authentication.AuthenticationProtocolState;
import com.sshtools.j2ssh.session.SessionChannelClient;
import com.sshtools.j2ssh.configuration.SshConnectionProperties;
import com.sshtools.j2ssh.transport.ConsoleHostKeyVerification;
public class MySSHClient {
SshClient ssh = null;
SshConnectionProperties properties = null;
SessionChannelClient session = null;
public MySSHClient(String hostName, String userName, String passwd )
{
try
{
// Make a client connection
ssh = new SshClient();
properties = new SshConnectionProperties();
properties.setHost(hostName);
// Connect to the host
ssh.connect(properties, new ConsoleHostKeyVerification());
// Create a password authentication instance
PasswordAuthenticationClient pwd = new PasswordAuthenticationClient();
pwd.setUsername(userName);
pwd.setPassword(passwd);
// Try the authentication
int result = ssh.authenticate(pwd);
// Evaluate the result
if (result==AuthenticationProtocolState.COMPLETE) {
System.out.println("Connection Authenticated");
}
}
catch(Exception e)
{
System.out.println("Exception : " + e.getMessage());
}
}//end of method.
public String execCmd(String cmd)
{
String theOutput = "";
try
{
// The connection is authenticated we can now do some real work!
session = ssh.openSessionChannel();
if ( session.executeCommand(cmd) )
{
IOStreamConnector output = new IOStreamConnector();
java.io.ByteArrayOutputStream bos = new
java.io.ByteArrayOutputStream();
output.connect(session.getInputStream(), bos );
session.getState().waitForState(ChannelState.CHANNEL_CLOSED);
theOutput = bos.toString();
}
//else
//throw Exception("Failed to execute command : " + cmd);
//System.out.println("Failed to execute command : " + cmd);
}
catch(Exception e)
{
System.out.println("Exception : " + e.getMessage());
}
return theOutput;
}
}
I tried to go to a directory then list the files using the ls command but it didn't work
MySSHClient sshc = new MySSHClient(<hostName>, <userName>, <passwd>);
System.out.println( sshc.execCmd("cd test") );
System.out.println( sshc.execCmd("ls") );
Any help please?

Answer 1

Try separating commands by a semicolon. For example: System.out.println( sshc.execCmd("cd test; ls") );

Answer 2

Add the and operator (&&) between the commands:
System.out.println( sshc.execCmd("cd test && ls") );
&& is better than ; because if the cd fails the ls is not executed.

Answer 3

Instead of using executeCommand, try to write your commands in output stream - session.getOutputStream() with '\n' addition on the end.
Then read input stream.
For example:
session.getOutputStream().write((command + "\n").getBytes());