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Kill a process running on port 8080

 $ lsof -i :8080 | awk 'NR > 1 {print $2}' | xargs --no-run-if-empty kill

— by Janos on Sept. 1, 2017, 8:31 p.m.

Explanation

lsof lists open files (ls-o-f, get it?). lsof -i :8080 lists open files on address ending in :8080. The output looks like this

COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
chrome  2619 qymspace  149u  IPv4  71595      0t0  TCP localhost:53878->localhost:http-alt (CLOSE_WAIT)`

We use awk 'NR > 1 {print $2}' to print the second column for lines except the first. The result is a list of PIDs, which we pipe to xargs kill to kill.

Limitations

The --no-run-if-empty option of xargs is available in GNU implementations, and typically not available in BSD implementations. Without this option, the one-liner will raise an error if there are no matches (no PIDs to kill).