LINUX COMMAND ATLAS · COMMAND GUIDE

Linux ss command

Show socket information. The flags below list listening TCP and UDP ports.

iproute2

Syntax

Command form

ss [OPTIONS] [FILTER]

7 options

Option	What it does
`-t, --tcp`	Display TCP sockets.
`-u, --udp`	Display UDP sockets.
`-l, --listening`	Display listening sockets.
`-n, --numeric`	Do not resolve service names or addresses.
`-p, --processes`	Show the process using each socket (permissions may limit details).
`-a, --all`	Display listening and non-listening sockets.
`-s, --summary`	Print socket usage summary.

3 examples

Show socket information. The flags below list listening TCP and UDP ports.

ss -tuln

Show listening TCP/UDP sockets and associated processes.

ss -tulpn

List established TCP connections numerically.

ss -tan state established

Process names may be hidden without sufficient privileges. Socket filters have their own syntax; check the manual for complex expressions.