Sometimes you want to kill whatever is running on a specific port. One way to do this is to first use netstat -tpln or ss -l to identify the PID of the process running on the given port. Then note the PID and then kill it using kill $PID.

fuser lets you do this in a single command:

To kill processes with TCP port 8080 open, IPv4 and IPv6

fuser -k 8080/tcp

To kill processes with TCP port 8080 open only on IPv6:

fuser -k -6 8080/tcp

To kill processes with UDP port 5300 open

fuser -k 8080/udp