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Thread: How to Create a shell script to test the telnet connection status
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Old 03-19-2009
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pludi pludi is online now Forum Staff  
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nmap isn't quite that useful to test connections. You could install netcat and test the connection using the -z switch, eg
Code:
netcat -z ${MACHINE} 23
if [ $? -eq 0 ]
then
    echo "Telnet accepting connections"
else
    echo "Telnet connections not possible"
fi

Or, if you have bash available and don't want to install anything else you could try replacing the netcat call with
Code:
exec 3>/dev/tcp/${MACHINE}/23

But this is really, really fugly.