netstat tldr

pages/linux/netstat.md

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+# netstat
+
+> Displays various networks related information such as open connections, open socket ports etc
+
+-List all ports
+
+`netstat -a`
+
+-List all listening ports
+
+`netstat -l`
+
+-Display PID and program names
+
+`netstat -p`
+
+-Find out which port a process is running (e.g. find out which port ssh is listening on)
+
+`netstat -ap | grep ssh`
+
+-Find out which process is listening on a particular port
+
+`netstat -ap | grep ':80'`