telnetlib

Eddie Corns eddie at holyrood.ed.ac.uk
Fri Jan 10 18:15:36 CET 2003


"Dickerson, Dee" <Dickerson4 at dow.com> writes:

>Below is telnet code that I am trying to get going.  I am going from a Windows2000 machine to a Redhat Linux machine; the ls command will not run as I can tell; it does not return any output.
> 
>I need to be able to execute other commands such as ps with options such as
> 
>ps -eda -format pid,command |grep legion-server,,,,, etc|
> 
>I would appreciate any help that anyone could offer.
> 
> 
>import telnetlib
>import sys
>from hostlistdee import hostlistdee
> 
>user='legion'
>pw='*******'
> 
>for host in hostlistdee:
>   try:
>      tn=telnetlib.Telnet(host)
>      tn.read_until("login: ")
>      tn.write(user+'\n') 
>      tn.read_until('Password: ')
>      tn.write(pw+'\n')
>      tn.write('ls\n')
>      tn.write('exit\n')
>      tn.read_all()
>      tn.close()
>      print 'started ',host
>   except:
>      print 'failed ',host
>   # end try
># end def

2 things.  How do you know there's no output if you don't print the results
from tn.read_*? and secondly you should never close a telnet connection until
you've safely read all outstanding data because closing the connection flushes
all outstanding data and you don't see it.  The 'exit' command, I think, will
cause the far end to close the connection.




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