Use `netstat` and `lsof` to find out which command/process is listening on a port on OS X

find-proc-for-port.txt

It is often useful to figure out which OS X command/process is listening on a specific IP port

On Linux this can be done with the `netstat -p` 

On OS X, the process id along with a lot of other info can be can be shown using the verbose `-v` flag:
  * `sudo netstat -anlv |grep -e Address -e LISTEN` - will display the LISTENing processes along with the column header
  
This variant outputs a comman-delimited list of the processes that are LISTENing:
  * `sudo netstat -anlv |grep  -e LISTEN | awk '{print $9}'| sort -nu| tr "\n" "," | sed s/,$//`
  
This can also be done using `lsof` - perhaps easier because it displays both the Command and PID:
  * `sudo lsof -iTCP -sTCP:LISTEN -n -P`