Archlinux free used port

// Install lsof package (example for archlinux)
sudo pacman -S lsof 

// List ports that are being used
sudo lsof -i -P -n | grep LISTEN

// lsof output example, the 2nd value is the process id (6951)
Discord   6951 damian   49u  IPv4  47939      0t0  TCP 127.0.0.1:6463 (LISTEN)

// kill the process
kill 6951

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