Find process listening on a port

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))

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