Send String over netcat connection
Question:
I have two virtual machines open, one is listening on the connection, the other connects with nc <ip> <port> from a python subprocess call. I want to send just 1 line of text over the connection then close it. I know how to send a file cat cat <file> | nc <ip> <port> but how can I just send a line of text in the nc command (without using files)?
Answers:
Try this:
echo -n 'Line of text' | nc <ip> <port>
You can also use temp file syntax:
cat <(echo "Line of test") | nc <ip> <port>
Create file test.txt, content of file is 1
netcat [ip-address] [port] <test.txt
At destination you must have something to listen to this.
The temp file syntax shown by @cb0 could also be used as:
nc <ip> <port> <( echo "Line of text" )
without having to use cat command. This would create a temporary file with the content "Line of text" and then redirect it to the netcat command.
-N flag is required to exit nc after a message is sent for some servers:
echo "text" | nc -N <ip> <port>
-N shutdown(2) the network socket after EOF on the input.
Some servers require this to finish their work.
— man nc
I have two virtual machines open, one is listening on the connection, the other connects with nc <ip> <port> from a python subprocess call. I want to send just 1 line of text over the connection then close it. I know how to send a file cat cat <file> | nc <ip> <port> but how can I just send a line of text in the nc command (without using files)?
Try this:
echo -n 'Line of text' | nc <ip> <port>
You can also use temp file syntax:
cat <(echo "Line of test") | nc <ip> <port>
Create file test.txt, content of file is 1
netcat [ip-address] [port] <test.txt
At destination you must have something to listen to this.
The temp file syntax shown by @cb0 could also be used as:
nc <ip> <port> <( echo "Line of text" )
without having to use cat command. This would create a temporary file with the content "Line of text" and then redirect it to the netcat command.
-N flag is required to exit nc after a message is sent for some servers:
echo "text" | nc -N <ip> <port>
-N shutdown(2) the network socket after EOF on the input.
Some servers require this to finish their work.—
man nc