====== Rare Linux commands ====== ===== List ports open by a certain application ===== ''$ lsof -i 4 -a -p <PID>'' (-i 4 stands for IPv4) Source: http://www.cyberciti.biz/faq/how-do-i-find-out-what-ports-are-listeningopen-on-my-linuxfreebsd-server/ ===== Equivalents to "top" ===== ==== I/O ==== $ iotop ==== Network bandwidth ==== $ nethogs