01-03-2018
How to break out of hung or waiting telnet session in shell script?
I have to put together telnet instructions for 100s of hosts for verifying basic connectivity and get output in a neat format.
Problem- If a telnet is hung with message "Trying .... <hostname" due to firewall or routing issue the commands waits for a very long time before it times out and my shell script gets to execute next command. Please advise how to breakout of such hung telnet and resume on next line.
Last edited by Scott; 01-03-2018 at 06:31 AM..
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LEARN ABOUT OPENSOLARIS
cports
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)