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Top Forums UNIX for Dummies Questions & Answers How to disconnect telnet prompt with port no in script. Post 302684529 by Corona688 on Thursday 9th of August 2012 05:10:39 PM
Old 08-09-2012
You can try redirecting /dev/null into it. telnet hostname port </dev/null

It should connect, try and read input from /dev/null, get EOF, and quit.

telnet may not really be the tool for the job here, however! It's an interactive program and very difficult to automate. netcat (nc) would be better suited if you can get it, it's designed to be noninteractive from the first.
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cports(1M)						  System Administration Commands						cports(1M)

NAME
cports - expand host names into <host, server, port> triples SYNOPSIS
$CLUSTER_HOME/bin/cports hostname [hostname...] DESCRIPTION
The cports utility expands the hostname arguments into a list of <host, server, port> triples. The returned information is used to access the serial port consoles of the named hosts by way of the terminal server returned in the triples. If an entry for serialports has been made in the /etc/nisswitch.conf file, then the order of lookups is controlled by that entry. If there is no such file or no such entry, then the nameservice look up order is implicitly nis files. EXAMPLES
Example 1 Using the cports Command If the /etc/serialports file contains the entry: pepsi soda-tc 5002 the following command: % cports pepsi prints the following string: pepsi soda-tc 5002 This information can be used by the telnet(1) command to remotely access pepsi's console: % telnet soda-tc 5002 ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWccon | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
telnet(1), cconsole(1M), ccp(1M), chosts(1M), crlogin(1M), cssh(1M), ctelnet(1M), serialports(4), attributes(5) Sun Cluster 3.2 8 Sep 2007 cports(1M)
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