perfect, that works,
thanks so much.
                
            
        
    
    
        
        
            
            
                I am able to connect through client of WinSCP able to connect successfully. after enters RSA password manually when it ask for Passpharase for rsa-key-20150518   (keyboard entering is required) already setup Private Key, 
but through scripting how to do I achieve this?
I wanted to automatically login and do some get/post jobs.