This one is a great one. Every wonder what is all running or listening on your linux box? There is a simple command you can run that will give you a very detailed view of what is running. The command is:
sudo netstat –pltn
After you run that command you will see something similar:
As you can see on my test machine I am running a SSH Server(SSHD), Printer server (cups), Dropbox, Vinoserver(VNC), Apache Server (Web). If you don’t use “sudo” in the command you might receive an error that you can’t view all the running processes.