In the old days, I used netstat -nlp | grep -w <port>. These days
(2022), ss the preferred tool to use:
$ ss -lptn | grep -w 8080
LISTEN 0 4096 *:8080 *:* users:(("java",pid=205361,fd=327))
With ss, we can even do without the grep by asking for the
source port directly::
$ ss -lptn 'sport = :8080'
State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
LISTEN 0 4096 *:8080 *:* users:(("java",pid=205361,fd=327))
