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Accepted
OcK
Asked: 2018-02-11 08:52:14 +0800 CST

connect via netcat and send messages in bash script [duplicate]

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When I am writing a bash script like the following:

#!/bin/bash

nc localhost [pseudoport]
echo "test"

it connects to the server but does not send the text "test".

It works with 

#!/bin/bash

echo "test" | nc localhost [pseudoport]

The problem here is that the connection exits after something has been received.

How can I send multiple messages, in my case a fixed preamble followed by a variable data?

scripts networking bash netcat

1 Answers

  1. Best Answer

    I have found a way to do this here: Send Commands to socket using netcat

    You have to put the messages you want to send in a textfile (lets say msg.txt) and then

    nc localhost [pseudoport] < msg.txt

    The text file should look like this:

    message1
message2
message3
...

    Every message has to be in a new line.

    The link I posted has a better explanation why this has to be done the way it is done here (there is no explanation in the duplicate article).

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