can we telnet the system using shell script

suchi_s · 02-18-2005, 12:58 AM

code to telnet the system and pass user name and password through shell script.. is it possible?
it can be done using expect..
is it possible through shell script

druuna · 02-18-2005, 03:26 AM

Hi,

This are 2 ways of doing it:

1) using a HERE document

Code:

telnet  some.site.com <<-HERE
  command
  command
  .
  .
  command
  exit
HERE

Everything between HERE and HERE is given to telnet and executed by telnet.

2) Echoing to telnet

Code:

{
  echo "command"
  echo "command"
  echo "exit"
} | telnet some.site.com

Hope this gets you going again.

Libu · 02-18-2005, 03:35 AM

I dont thing we can pass the password and login through telnet ( even if this is possible, I guess its not a very good idea at all !) The only way we can do this is by using .netrc file in $HOME/.netrc.
The format of a .netrc file

Code:

machine xxx.x.com
login xxx
password xxxxx

suchi_s · 02-18-2005, 03:39 AM

how to do with .netrc file.. what all i have to do

druuna · 02-18-2005, 03:45 AM

Hi,

@Libu: I don't have telnet (client/sserver) installed, so I could not try it out, but it works for sql/ftp including the user/password part (on the other hand it does not for ssh).

I do agree that telnet is unsave and shouldn't be used, but that was not the question the OP asked

And even a .netrc file is unsave.

The .netrc solution you (Libu) gave is an elegant way of doing it. Although I don't know if it'll work for telnet, never tried. It does for ftp, that's for sure.

suchi_s · 02-18-2005, 03:46 AM

how to create this file it does not reside in home

druuna · 02-18-2005, 03:49 AM

Hi,

Use you fav editor and create it:

vi ~/.netrc

fill it with the appropriate commands (machine xxx.x.com, login xxx, password xxxxx) each on its own line.

Hope this helps.

suchi_s · 02-18-2005, 03:53 AM

how to run it.. does it do the file transfer and how ?
what is the complete procedure?

jlliagre · 02-18-2005, 03:56 AM

.netrc is for ftp only and doesn't apply to telnet (as far as I know).
There's a .telnetrc file, but not suitable to pass credentials
You should use rlogin/rsh instead, or better ssh which all allow non-interactive login.

suchi_s · 02-18-2005, 04:08 AM

can i ftp a system through some gateway

jlliagre · 02-18-2005, 04:21 AM

Yes, you can ftp to a system through either an http or a socks proxy.

PS: You should have better started another thread as this last question has nothing to do with the initial one.

Libu · 02-18-2005, 04:22 AM

Oops, yes the .netrc was for ftp and not telnet

. I overlooked that. Sorry for wasting your time.

As for telnet, using expect is the only answer that I can think off ! Dont know of anyother way, you can automate logging to another machine through telnet.

suchi_s · 02-18-2005, 04:23 AM

i want to write the script which would first telnet the gateway from local system and then from gateway will do the ftp on other system

jlliagre · 02-18-2005, 04:32 AM

Forget telnet and ftp.

Code:

ssh gateway scp othersystem:/somefile /somedir

suchi_s · 02-18-2005, 04:34 AM

i dint get it..
how to do?