I try to start the Python SimpleHTTPServer on port 7054 :
$ sudo python -m SimpleHTTPServer 7054
...
socket.error: [Errno 98] Address already in use
So, I ran the following commands :
$ sudo netstat -ntpu | grep 7054
$ sudo lsof -i -n -P | grep 7054
But I have no results.
From the netstat
manpage:
netstat [address_family_options] [--tcp|-t] [--udp|-u] [--raw|-w] [--listening|-l] [--all|-a] [--numeric|-n] [--numeric-hosts] [--numeric-ports]
[--numeric-users] [--symbolic|-N] [--extend|-e[--extend|-e]] [--timers|-o] [--program|-p] [--verbose|-v] [--continuous|-c]
I use the following options:
sudo netstat -tanl | grep 7054
Which is --numeric
, --tcp
, --all
, --listening
I think the minimal netstat
options you need to show the pid of the process listening on a particular port are -nlp
.
The lsof
options you specify work for me. Using the example code at https://wiki.python.org/moin/UdpCommunication#Receiving and python -m SimpleHTTPServer 7054
:
$ netstat -nlp | grep 7054
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 0.0.0.0:7054 0.0.0.0:* LISTEN 20458/python
udp 0 0 0.0.0.0:7054 0.0.0.0:* 20498/python
$ lsof -i -n -P | grep 7054
python 20458 michael 3u IPv4 143736 0t0 TCP *:7054 (LISTEN)
python 20498 michael 3u IPv4 173739 0t0 UDP *:7054
Extra credit: stick it in an alias:
listening() {
netstat -nlp | grep $1
}
And use it:
$ listening 7054