What does `netstat` do? Flags & examples explained

netstat examples, explained

$ netstat -tulpn

netstatshow network connections, routing tables, and interface stats
-tTCP connections
-uUDP connections
-lonly listening sockets
-pshow the PID and program name for each socket
-nnumeric output — don't resolve hosts, ports, or users

$ netstat -rn

netstatshow network connections, routing tables, and interface stats
-rshow the kernel routing table
-nnumeric output — don't resolve hosts, ports, or users

netstat flags & options

-t	TCP connections
-u	UDP connections
-l	only listening sockets
-p	show the PID and program name for each socket
-n	numeric output — don't resolve hosts, ports, or users
-a	all sockets (listening and non-listening)
-r	show the kernel routing table
-e	extended information
-s	per-protocol summary statistics
-c	continuously refresh the display

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