Java program to run shell commands from a windows machine

Question

I am trying to run a Java program to shell out commands on a remote (Linux) machine. I can get the putty.exe to run and then connect to the machine using SSH keys. But am not able to run the actual commands such as "bash" "ps-ef" or "ls -la". Currently using the Java runtime.exec, not sure if using the java.lang.ProcessBuilder would help? What am I doing wrong ? Any help/guidance would be greatly appreciated.. Thanks in advance

package hello;

import java.io.*;
public class RuntimeExample {




     public static void main(String args[]) throws IOException {



    try{     


    Runtime runtime = Runtime.getRuntime();
    Process process = runtime.exec(new String[]{"C:\\Users\\yky90455\\Desktop\\putty.exe","[email protected]","bash", "ps -ef"});


    InputStream is = process.getInputStream();
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr);
    String line;

    System.out.printf("Output of running the command is:");

    while ((line = br.readLine()) != null) {
        System.out.println(line);

      }                                                             

    } catch (Exception e) {
        e.printStackTrace();
    }
}   

}

Why don't you use a SSH library for that, instead of using putty? — BackSlash
– BackSlash, Commented Sep 19, 2014 at 8:33
The whole point of Java is abstract away from the OS. Always search for a platform independent alternative before resorting to calling native commands. In your example simply use an SSH implementation for Java - such as sshj. — Boris the Spider
– Boris the Spider, Commented Sep 19, 2014 at 8:44
Thanks for your quick response. I will check out sshj and Jsch. — joule_wonder
– joule_wonder, Commented Sep 19, 2014 at 8:53
Begs the next question, possibly another thread. What is the best SSH library that will facilitate using SSH keys to connect to a remote linux machine and execute commands — joule_wonder
– joule_wonder, Commented Sep 19, 2014 at 9:52

Shashank Vivek · Accepted Answer · 2014-09-19 08:46:53Z

2

try Jsch From here to get the shell scrips executed from Java to some remote Linux machine. I have worked on this and it was really fun.although you may find little shortage of docs for understanding this but you can overcome that easily.

answered Sep 19, 2014 at 8:46

Shashank Vivek

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2 Comments

joule_wonder Over a year ago

Thanks for your quick response. I will check out sshj and Jsch.

Shashank Vivek Over a year ago

@joule_wonder: Welcome.But make sure to mark this answer if you go for Jsch :)

Rai · Accepted Answer · 2014-09-19 09:04:39Z

0

Also consider ExpectJ which is a wrapper around TCL Expect. The project does not appear to have any active development since mid 2010, but I have used it for SSH in the past.

http://expectj.sourceforge.net/apidocs/expectj/SshSpawn.html

answered Sep 19, 2014 at 9:04

Rai

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Comments

joule_wonder · Accepted Answer · 2014-09-22 09:18:13Z

0

Thanks for all your answers. I tried Ganymed SSH-2 library. It works well for the basic commands on the remote machine. I will have to explore other APIs in case I run into any limitation with SSH-2.

answered Sep 22, 2014 at 9:18

joule_wonder

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Comments

parakmiakos · Accepted Answer · 2015-09-16 07:03:53Z

-1

public class triggerPutty {
    public static void main(String[] a) {
        try {
            String command = "putty.exe [email protected] -pw password -m C:\\containing_comman.txt";
            Runtime r = Runtime.getRuntime();
            Process p = null;
            p = r.exec(command);
            p.waitFor();
            p.destroy();
        } catch (Exception e) {
            e.printStackTrace();
        }    
    }
}

-m helps to run your command from that file.
You can keep N number of commands in that file.. ## Heading ##

edited Sep 16, 2015 at 7:03

parakmiakos

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answered Sep 15, 2015 at 17:13

SATHIYA B

1

1 Comment

JNYRanger Over a year ago

Consider improving your answer. Code-only answers may fall under 'Very Low Quality' ...and are candidates for deletion....We've always touted that we aren't a code factory. We are the people who teach others to fish. Code-only answers only feed a person for a day

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