Guru2
Sorry I don't have specific example, but I have used a library to perform the tasks you describe that you could look into to see if it meets your needs...
It is Jsch by JCraft
http://www.jcraft.com/jsch/
Download the .jar file and place in your installation .lib folder.
add "import com.jcraft.jsch.*;" import line to you groovy script test step to use features in examples.
Their website has some java examples you can drop right into groovy script test steps.
http://www.jcraft.com/jsch/examples/
I used to execute commands on remote computers with this library successfully and relatively painless.
Regards,
Todd
