How to use netcat test tcp/ip port

當在telnet中輸入文字時，預設情況下它在Linemode中運行，每行發送數據封包，因此只需按Enter將命令發送到遠端主機。

To test Telnet in Linemode, you can run the dummy server to be listening on the local port, e.g. by using netcat (install if needed):

nc -vl localhost 1234

then in another terminal connect to your server by:

telnet localhost 1234

and start entering some text to check when the data is received.

Hit Control–] (^]) and type quit to finish.

It is also possible to send data using Bash shell by the following command:

cat > /dev/tcp/127.0.0.1/1234

then start entering text. When finished, hit Control–D.