# To open a TCP connection from <src-port> to <dest-port> of <dest-host>, with a timeout of <seconds>
nc -p <src-port> -w <seconds> <dest-host> <dest-port>
# To open a UDP connection to <dest-port> of <dest-host>:
nc -u <dest-host> <dest-port>
# To open a TCP connection to port 42 of <host> using <source-host> as the IP for the local end of the connection:
nc -s <source-host> <dest-host> <port>
# To create and listen on a UNIX-domain stream socket:
nc -lU /var/tmp/dsocket
# To connect to <dest-port> of <dest-host> via an HTTP proxy at <proxy-host>,
# <proxy-port>. This example could also be used by ssh(1); see the ProxyCommand
# directive in ssh_config(5) for more information.
nc -x<proxy-host>:<proxy-port> -Xconnect <dest-host> <dest-port>
# The same example again, this time enabling proxy authentication with username "ruser" if the proxy requires it:
nc -x<proxy-host>:<proxy-port> -Xconnect -Pruser <host> <port>
# To choose the source IP for the testing using the -s option
nc -zv -s source_IP target_IP Port
# Start nc as a server for testing
- while true; do printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index_qa.html)" | nc -l 7070; done
- Copy data. This requires netcat on both servers.
- Destination box: nc -l -p 2342 | tar -C /target/dir -xzf -
- Source box: tar -cz /source/dir | nc Target_Box 2342
