What changes do I need to make in the netcat command line to send multiple requests simultaneously?

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To send multiple requests simultaneously using netcat, you can use concurrent connection tools like GNU Parallel or xargs.

For example, using GNU Parallel, you can use the following command:

echo -e "request1\nrequest2\nrequest3" | parallel -j3 'echo {} | nc <host> <port>'

This will send three requests simultaneously to the specified host and port.

Alternatively, you can use xargs to achieve the same result:

echo -e "request1\nrequest2\nrequest3" | xargs -P3 -I{} nc <host> <port> <<< {}

This will also send three requests simultaneously to the specified host and port.