nc
$ nc [--length ] [--listen] [-N] [-n] [--udp] [-p port] [--verbose] [target] [port]
Network cat: Connect to network sockets as if it were a file.
-I
, --length
: Set maximum tcp receive buffer size-l
, --listen
: Listen instead of connecting-N
: Close connection after reading stdin to the end-n
: Suppress name resolution-u
, --udp
: UDP mode-p port
: Local port for remote connections-v
, --verbose
: Log everything that's happening-z
, --test-listening-service
: Test a TCP-listening servicetarget
: Address to listen on, or the address or hostname to connect toport
: Port to connect to or listen on