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Top Forums Shell Programming and Scripting How to Create a shell script to test the telnet connection status Post 302299005 by yhcheong on Thursday 19th of March 2009 02:52:10 AM
Old 03-19-2009
Hi Pludi,

Thanks for the suggestion, if running bash. I think it is same by executing below command
for one by one(since I have hundred over telnet connection). The telnet connection port is
2071

% telnet 10.x.x.x 2071

for the bash command
exec 3>/dev/tcp/${10.x.x.x}/2071
if [ $? -eq 0 ]
then
echo "Telnet accepting connections"
else
echo "Telnet connections not possible"
fi

It seems like not working.

bash: /dev/tcp/${10.x.x.x}/2071: bad substitution.


Do you have any idea which can lead me to run the script in one shot, and the output is the hundred over telnet connection status. THanks in advance!
 

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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)
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