I am writing a SHELL SCRIPT (in ksh) to automate telnet login. What I have to do is I have the hostname and the ipaddress and I have to use command telnet <ipaddress>, but the command requires the username and password to login to the host. I need to write the script where the username and the password will already be provided and there will be no need to user intervention

i am not agreed for this is a security risk. i will suggest u pls go for ssh.

an write a script for ssh. its secure and no password is required once on generated the ssh an rsa keys.

This is a configuration required to run particular stuff.
Could you suggest the method to automate the telnet login

This is straight from my router which logins to my modem when it isn't able to ping the gateway.
My modem is configured in zipB but doesn't retain its settings after a reboot. This has been running for more than a year.....

It works great for telnet.
ssh doesn't work with the above example (as I found out). plink (ssh for windows) does work. I wrote something in bash for windows like that as well (to automatically configure modems)

If you want to do something more advanced, you should look at "expect"
It will give the appropriate commands at the right moment..

I just finished a script that automatically logins to routers and get their status. It does it using ssh or telnet.
I had a little problem with it, but could finally solve it.
I placed a question here...
Maybe you can get some info out of it...
http://www.linuxquestions.org/questi...t-in-it-735271

There can be good reasons for passwordless telnet access. See: "telnet towel.blinkenlights.nl" for example.