ss − another utility to investigate sockets
ss [options] [ FILTER ]
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.
follow the usual GNU command line syntax, with long options
starting with two dashes (‘-’). A summary of
options is included below.
Show summary of options.
Output version information.
Do now try to resolve service names.
Try to resolve numeric address/ports.
Display all sockets.
Display listening sockets.
Show timer information.
Show detailed socket information
Show socket memory usage.
Show process using socket.
Show internal TCP information.
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.
Display only IP version 4 sockets (alias for -f inet).
Display only IP version 6 sockets (alias for -f inet6).
Display PACKET sockets.
Display only TCP sockets.
Display only UDP sockets.
Display only DCCP sockets.
Display only RAW sockets.
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
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.
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.
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
List all the tcp sockets in state FIN-WAIT-1 for our apache to network 193.233.7/24 and look at their timers.
ip(8), /usr/share/doc/iproute-doc/ss.html (package iproutedoc)
ss was written by Alexey Kuznetosv, <kuznet [AT] ms2.ru>.
This manual page was written by Michael Prokop <mika [AT] grml.org> for the Debian project (but may be used by others).