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So I have a similar issue to this https://stackoverflow.com/questions/10172860/linux-script-to-parse-telnet-message-and-exit

I have a bash script
In that script I need to
* non interactively connect to TCP port localy.
* Store the strings that I get as I connect
* Compare that string with what I expect the answer to be.

Here is a solution that don't work:

#!/bin/bash
VALIDTELNET="parastat vdev"
# Test telnet
TELNET=$(echo | nc 127.0.0.1 22196)
if [[ "$TELNET" == "$VALIDTELNET" ]]
then
echo "Telnet Ok" ;
else
echo "Telnet connection test failed"
ERROR=22196
fi

--

I've also used telnet, curl, exec 3<>/dev/tcp/127.0.0.1/22196, etc.

I either have the string but it is interactive, or the connection stops, but I don't get the strings.

Note: Why bash, why not X?
I only want bash, because this is test script and I don't want to install more stuff during the test run.

Help appreciated :3