====== netcat ======

^ Connectivity testing ^^
| ''nc $host $port'' | establish connection to port (telnet-style) |
| ''nc -u $host $port'' | ::: |
| ''nc -vz $host $port'' | check if port is open |
| ''nc -vz $host $minport-$maxport'' | ::: |
| ''nc -l $port'' | listen on a port |
^ Communication/data transfer ^^
| ''nc -l $port | tar -xzf -'' | Listen on a port and pipe somewhere |
| ''tar -czf - $files | nc $host $port'' | Pipe to netcat and send |