Testing telnet connections in a script


 
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Old 01-12-2007
Testing telnet connections in a script

Hi,

I am trying to figure out how to test to see if a server is accepting telnet connections via a script.

I have several remote MPE servers that are set in single user mode (and hence not accepting telnet connections), for their backups, I want to try and automate a test (from a unix server), to see if telnet connections are available and hence if the servers are still in single user mode.

Hmm ... not sure how clear that was ... I basically want to do something like this:

while true
do
telnet <server_name> > richtmp &
echo $! > richtmp.PID
***some kind of grep thing on 'richtmp' to see if the connection worked***
kill `cat richtmp.PID`
sleep 60
done


.... but more elegantly. Is there an option to the telnet command that will do this?

many thanks,

Richard
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telnetrc(4)						     Kernel Interfaces Manual						       telnetrc(4)

NAME
telnetrc, .telnetrc - Specifies setup commands for a telnet session SYNOPSIS
$HOME/.telnetrc DESCRIPTION
The .telnetrc file contains the setup information for a telnet session. It is a hidden file in your home directory and must be readable by the user logging in. The file can consist of multiple entries for each remote host to which a user can connect. A remote host entry consists of multiple lines. The first line is the name of a remote host. The subsequent lines must begin with blank spaces, and contain telnet subcommands. These sub- commands are processed as though they were typed in manually. Lines beginning with a number sign (#) are comment lines. See telnet(1) for a complete list of telnet subcommands. To specify subcommands that apply to all systems, create an entry, using the word "DEFAULT" as the system name, and specify the telnet sub- commands in the subsequent lines. EXAMPLES
The following shows a sample .telnetrc file: # Beginning of telnetrc file # Default subcommands that apply to all systems DEFAULT environ undefine USER # First system entry system1 set echo toggle crlf # Second system entry system2 set echo mode line toggle crlf FILES
User-customized telnet startup values. RELATED INFORMATION
Commands: telnet(1). delim off telnetrc(4)