To show all networking related to a given port:
lsof -i TCP:port # port with specified protocol
lsof -i :22
-P
disables port aliasing. Will show
lsof -P -i :port
-p
lets you specify a given pid. In the following example, we would get
all TCP connections opened by process with process id <pid>
.
-a
makes
all conditions specified by the different flags be ANDed.
lsof -i TCP -P -a -p <pid>