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Full Discussion: Telnet Expect script question
Top Forums Shell Programming and Scripting Telnet Expect script question Post 302341147 by stinkefisch on Wednesday 5th of August 2009 10:43:55 AM
Old 08-05-2009
Telnet Expect script question
Hi all,

I have written a small expect script which should spawn a telnet session login and execute some commands.

Code:
#!/usr/bin/expect -f

spawn telnet  $env(IP)
match_max 100000
expect "login:"
send -- "******\n"
expect -exact "Password:"
send -- "****\n"
expect "%"

Now I have got the following problem..................
If the telnet service is not running on the server, I would like to see the script to fail, but the script still carrys on to execute the commands, even it is not logged in?????
How can I stop this please?

---------- Post updated at 09:43 AM ---------- Previous update was at 05:55 AM ----------

Just in case someone else has the same problem.

I could sort it with

Code:
nc -w 5 -z ${MACHINE} 23
if [ $? -eq 0 ]
then
    echo "Telnet accepting connections"
else
    echo "Telnet connections not possible"
fi

Last edited by DukeNuke2; 08-05-2009 at 11:46 AM.. Reason: added code tags
 

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LEARN ABOUT DEBIAN

rxtelnet

RXTELNET(1)						    BSD General Commands Manual 					       RXTELNET(1)

NAME

     rxtelnet -- start a telnet and forward X-connections.

SYNOPSIS

     rxtelnet [-l username] [-k] [-t telnet_args] [-x xterm_args] [-K kx_args] [-w term_emulator] [-b telnet_program] [-n] [-v] host [port]

DESCRIPTION

     The rxtelnet program starts an xterm window with a telnet to host host.  From this window you will also be able to run X clients that will be
     able to connect securely to your X server. If port is given, that port will be used instead of the default.

     If setting up the X forwarding failes, rxtelnet will still telnet in to the remote host, but without X forwarding.

     The supported options are:

     -l      Log in on the remote host as user username.

     -k      Disables keep-alives.

     -t      Send telnet_args as arguments to telnet.

     -x      Send xterm_args as arguments to xterm.

     -X      Send kx_args as arguments to kx.

     -w      Use term_emulator instead of xterm.

     -b      Use telnet_program instead of telnet.

     -n      Do not start any terminal emulator.

     -v      Be verbose.

EXAMPLE

     To login from host foo (where your display is) to host bar, you might do the following.

     1.   On foo: rxtelnet bar

     2.   You will get a new window with a telnet to bar.  In this window you will be able to start X clients.

SEE ALSO

     kx(1), rxterm(1), telnet(1), tenletxr(1), kxd(8)

KTH_KRB 							   March 7, 2004							   KTH_KRB
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