Kill a process running on port 8080

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

Sept. 1, 2017, 8:31 p.m. — Janos

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).

Related one-liners

1

Kill a process running on port 8080 

 $ lsof -i :8080 | awk '{print $2}' | tail -n 1 | xargs kill

Aug. 18, 2017, 8:22 a.m. — kimbethwel

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 pipe this input through awk to print column 2 using the command awk '{print $2}' to produce the output:

PID
2533

To remote the word PID from this output we use tail -n 1 to grab the last row 2533,

We can now pass this process id to the kill command to kill it.