Chapter 3: SSH Client Commands __Linux 101 Hacks

Chapter 3: SSH Client Commands 

        __Linux 101 Hacks

Hack 12. Identify SSH Client Version

 

  
    

   
     
   
     $ ssh 
   
     -
   
     V
OpenSSH_3.9p1, OpenSSL 
   
     0.9
   
     .7a Feb 
   
     19
   
      
   
     2003
   
     

  
    

 

The following example indicates that this particular system is using SSH2:

 

 

  
    

   
     
   
     $ ssh 
   
     -
   
     V
ssh: SSH Secure Shell 
   
     3.2
   
     .
   
     9.1
   
      (non
   
     -
   
     commercial version)
on i686
   
     -
   
     pc
   
     -
   
     linux
   
     -
   
     gnu

  
    

 

 

 

Hack 13. Login to Remote Host using SSH

 

  
    

   
     
   
     localhost$ ssh 
   
     -
   
     l jsmith remotehost.example.com

  
    

 

 

 

Hack 14. Debug SSH Client Session

 

  
    

   
     
   
     localhost$ ssh 
   
     -
   
     l jsmith remotehost.example.com

warning: Connecting to remotehost.example.com failed:
No address associated to the name

  
    

 

  
    

   
     
   
     locaclhost$ ssh 
   
     -
   
     v 
   
     -
   
     l jsmith remotehost.example.com

  
    

 

 

 

Hack 15. Toggle SSH Session using SSH Escape Character

come back to the localhost to perform some activity and go back to remote host again.

  
    

   
     
   
     localhost$ ssh 
   
     -
   
     l jsmith remotehost

remotehost$

remotehost$ 
   
     ~^
   
     Z
[
   
     1
   
     ]
   
     +
   
      Stopped ssh 
   
     -
   
     l jsmith remotehost

localhost$

  
    
  
    

   
     

  
    
  
    

   
     localhost$ jobs
  
    
  
    

   
     [1]+ Stopped ssh -l jsmith remotehost

  
    
  
    

   
     

  
    
  
    

   
     localhost$ fg %1
  
    
  
    

   
     ssh -l jsmith remotehost
  
    
  
    

   
     

  
    
  
    

   
     remotehost$

  
    

 

Hack 16. SSH Session Statistics using SSH Escape Character

  
    

   
     
   
     localhost$ ssh 
   
     -
   
     l jsmith remotehost


   
     #
   
     type ssh escape character ~ followed by s
   
     

   
     


   
     #
   
     Note: The ~s is not visible on the command line when you type.