ss(8) - Linux man page

Name

ss - another utility to investigate sockets

Synopsis

ss [options] [ FILTER ]

Description

ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informations than other tools.

Options

These programs follow the usual GNU command line syntax, with long options starting with two dashes ('-'). A summary of options is included below.
-h, --help
Show summary of options.
-V, --version
Output version information.
-n, --numeric
Do now try to resolve service names.
-r, --resolve
Try to resolve numeric address/ports.
-a, --all
Display all sockets.
-l, --listening
Display listening sockets.
-o, --options
Show timer information.
-e, --extended
Show detailed socket information
-m, --memory
Show socket memory usage.
-p, --processes
Show process using socket.
-i, --info
Show internal TCP information.
-s, --summary
Print summary statistics. This option does not parse socket lists obtaining summary from various sources. It is useful when amount of sockets is so huge that parsing /proc/net/tcp is painful.
-4, --ipv4
Display only IP version 4 sockets (alias for -f inet).
-6, --ipv6
Display only IP version 6 sockets (alias for -f inet6).
-0, --packet
Display PACKET sockets.
-t, --tcp
Display only TCP sockets.
-u, --udp
Display only UDP sockets.
-d, --dccp
Display only DCCP sockets.
-w, --raw
Display only RAW sockets.
-x, --unix
Display only Unix domain sockets.
-f FAMILY, --family=FAMILY
Display sockets of type FAMILY. Currently the following families are supported: unix, inet, inet6, link, netlink.
-A QUERY, --query=QUERY, --socket=QUERY
List of socket tables to dump, separated by commas. The following identifiers are understood: all, inet, tcp, udp, raw, unix, packet, netlink, unix_dgram, unix_stream, packet_raw, packet_dgram.
-D FILE, --diag=FILE
Do not display anything, just dump raw information about TCP sockets to FILE after applying filters. If FILE is - stdout is used.
-F FILE, --filter=FILE
Read filter information from FILE. Each line of FILE is interpreted like single command line option. If FILE is - stdin is used.
FILTER := [ state TCP-STATE ] [ EXPRESSION ]
Please take a look at the official documentation (Debian package iproute-doc) for details regarding filters.

Usage Examples

ss -t -a
Display all TCP sockets.
ss -u -a
Display all UDP sockets.
ss -o state established '( dport = :ssh or sport = :ssh )'
Display all established ssh connections.
ss -x src /tmp/.X11-unix/*
Find all local processes connected to X server.
ss -o state fin-wait-1 '( sport = :http or sport = :https )' dst 193.233.7/24
List all the tcp sockets in state FIN-WAIT-1 for our apache to network 193.233.7/24 and look at their timers.

See Also

ip(8), /usr/share/doc/iproute-doc-2.6.32/ss.ps (package iproute-doc)

Author

ss was written by Alexey Kuznetosv, <kuznet@ms2.inr.ac.ru>.

This manual page was written by Michael Prokop <mika@grml.org> for the Debian project (but may be used by others).

Referenced By

netstat(8)