ports
Easily see what's happening on your computer's ports
You can either use it as a binary or as a shell plugin.
Usage:
$ ports ls
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
UserEvent 254 carlos 4u IPv4 0x1835878847405b73 0t0 UDP *:*
sharingd 365 carlos 18u IPv4 0x18358788474051d3 0t0 UDP *:*
sharingd 365 carlos 22u IPv4 0x1835878847408b93 0t0 UDP *:*
WiFiAgent 912 carlos 8u IPv4 0x183587885019e6a3 0t0 UDP *:*
ruby 1620 carlos 8u IPv4 0x183587885e3c1c1b 0t0 TCP *:4000 (LISTEN)
$ ports show 4000
ruby 1620 carlos 8u IPv4 0x183587885e3c1c1b 0t0 TCP *:terabase (LISTEN)
$ ports kill 4000
$ ports show 4000Also try ports --help.