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expect is preferable, as it would allow you to check for good and bad passwords.
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expect is preferable, as it would allow you to check for good and bad passwords.

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Thanks, lanboyo. It worked perfectly!
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Hi All,<br />
I want to check telnet connectivity for a series of 50 IPs.<br />
I tried to automate the tasks using a script like the following:<br />
a=`echo pwd | telnet IP1`<br />
a=`echo pwd | telnet IP2`<br />
a=`echo pwd | telnet IP3`<br />
...<br />
...<br />
a=`echo pwd | telnet IP50`<br />
<br />
When I run the above script, it usually returns the chracaters &quot;Connection closed by foreign host&quot; for each IP. <br />
Sometimes it returns different messages like &quot;Connection refused&quot;, &quot;No route to Host&quot; etc. <br />
<br />
But the problem occurs when the telnet fails altogether for a IP. If the telnet fails for a particular IP, the script waits for 3 minutes and returns the characters &quot;telnet failed&quot; and then the script is terminated.<br />
Is there any way I can make the script return the character &quot;telnet failed&quot; within, say 3 seconds, for every IP it fails to connect to.<br />
In other words, if I just run the command &quot;telnet IP&quot; on UNIX prompt and the telnet fails then I should get back &quot;telnet failed&quot; message within 3 seconds instead of 3 mins.
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Hi All,
I want to check telnet connectivity for a series of 50 IPs.
I tried to automate the tasks using a script like the following:
a=`echo pwd | telnet IP1`
a=`echo pwd | telnet IP2`
a=`echo pwd | telnet IP3`
...
...
a=`echo pwd | telnet IP50`

When I run the above script, it usually returns the chracaters "Connection closed by foreign host" for each IP. 
Sometimes it returns different messages like "Connection refused", "No route to Host" etc. 

But the problem occurs when the telnet fails altogether for a IP. If the telnet fails for a particular IP, the script waits for 3 minutes and returns the characters "telnet failed" and then the script is terminated.
Is there any way I can make the script return the character "telnet failed" within, say 3 seconds, for every IP it fails to connect to.
In other words, if I just run the command "telnet IP" on UNIX prompt and the telnet fails then I should get back "telnet failed" message within 3 seconds instead of 3 mins.

Telnet connectivity query

Telnet is an application layer protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. SSH was designed as a replacement for Telnet and for unsecured remote shell protocols. The term telnet is also used to refer to the software that implements the client part of the protocol. SSH provides a secure channel over an unsecured network in a client-server architecture, connecting an SSH client application with an SSH server.