Manual Reference Pages  - SS (8)

NAME

ss - another utility to investigate sockets

CONTENTS

Synopsis
Description
Options
Usage Examples
See Also
Author

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

When no option is used ss displays a list of open non-listening TCP sockets that have established connection.
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 not try to resolve service names.
-r, --resolve
  Try to resolve numeric address/ports.
-a, --all Display both listening and non-listening (for TCP this means established connections) sockets.
-l, --listening
  Display only listening sockets (these are omitted by default).
-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 (alias for -f link).
-t, --tcp Display TCP sockets.
-u, --udp Display UDP sockets.
-d, --dccp Display DCCP sockets.
-w, --raw Display RAW sockets.
-x, --unix Display Unix domain sockets (alias for -f unix).
-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/ss.html (package iprouteĀ­doc)

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).


SS (8)
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