I'm using CentOS 7. I want to get the PID (if one exists) of the process running on port 3000. I would like to get this PID for the purposes of saving it to a variable in a shell script. So far I have
[rails@server proddir]$ sudo ss -lptn 'sport = :3000' State Recv-Q Send-Q Local Address:Port Peer Address:Port Cannot open netlink socket: Protocol not supported LISTEN 0 0 *:3000 *:* users:(("ruby",pid=4861,fd=7),("ruby",pid=4857,fd=7),("ruby",pid=4855,fd=7),("ruby",pid=4851,fd=7),("ruby",pid=4843,fd=7))
but I can't figure out how to isolate the PID all by itself without all this extra information.