l - Forcing netcat to listen on given host and port instead of opening/making connection with remote host and port
k - Forces nc to stay listening for another connection after its current connection is completed. It is an error to use this option without the -l option.
v - Give verbose output
u - Use UDP. That is, listen for UDP on give port, by default it listens for TCP unless we give this option.
l - Forcing netcat to listen on given host and port instead of opening/making connection with remote host and port
k - Forces nc to stay listening for another connection after its current connection is completed. It is an error to use this option without the -l option.
v - Give verbose output
u - Use UDP. That is, listen for UDP on give port, by default it listens for TCP unless we give this option.