What port are my apps using?

Their are two commands to look at

fuser and netstat

fuser will help in looking for port conflicts.

something like fuser -n tcp 80 would tell you what app is already using port 80.

netstat will list it all our for you.

netstat -nlp will give you programs, ports, and PIDS.

Both of these can be very useful. The main reason I have it posted on my blog is so I can stop forgetting these commands!