*nix networking – lsof: How to tell what process has a specific port open on Linux (via: Server Fault)
Posted by jpluimers on 2014/01/10
I usually used netstat with some grep filter for this, but Brandon Titus showed at StackOverflow that the lsof command is much easier to use:
lsof command should be able to do this just fine. Just use this:
lsof -i :<port_number>
lsof -i udp:<port_number>
lsof -i tcp:<port_number>and all of the processes should come up.
The lsof commands work on SUSE, Max OS X, CygWin and many other environments.
(update 20160304: added more arguments and links)
Two other commands I use often:
netstat -tulpn | sort
(for connected and listening tcp/udp ports it shows processes and port numbers; see the netstat parameters for more details, note that -u includes udp and -l adds listening sockets)
rpcinfo -p ; rpcinfo -s
(shows the ports used by rpcbind)
Note that one day I’ll learn the iproute2 equivalents (many of which have non descriptive 2 letter names like ip, iw, ss, tc, maybe because iproute2), but as OS X still doesn’t have iproute2, I’m hesitating. Anyway, that day:
–jeroen
via
- networking – How to tell what process has a specific port open on Linux? – Server Fault.
- Linux: Find Out Which Process Is Listening Upon a Port
- Troubleshooting faulty network connectivity, part 2: Essential network commands | Doug Vitale Tech Blog
The Wiert Corner - irregular stream of stuff 
some more lsof, netstat and rpcinfo examples « The Wiert Corner – irregular stream of stuff said
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