s等命令用于socket状态。他可以显示PACKET sockets，TCP sockets，UDP sockets，DCCP sockets，RAW sockets，Unix domain sockets。它比其他工具展示等多tcp和状态信息。

它是一个非常实用、快速、有效的跟踪 IP 连接和套接字的新工具。SS 命令可以提供如下信息：

• 所有的 TCP 套接字

• 所有的UDP套接字

• 全部ssh/ftp/ttp/https连接

• 所有连接到Xserver的本地进程

• 使用状态（例如：connected，synchronized，SYN-RECV，SYN-SENT，TIME-WAIT）、地址、端口过滤

• 所有的状态 FIN-WAIT-1 tcpsocket 连接以及更多

netstat# time netstat -ant | grep EST | wc -l3100
real 0m12.960suser 0m0.334ssys 0m12.561s# time ss -o state established | wc -l3204
real 0m0.030suser 0m0.005ssys 0m0.026s

ss -l 显示本地打开的所有端口ss -pl 显示每个进程具体打开的socketss -t -a 显示所有tcp socketss -u -a 显示所有的UDP Socektss -o state established '( dport = :smtp or sport = :smtp )' 显示所有已建立的SMTP连接ss -o state established '( dport = :http or sport = :http )' 显示所有已建立的HTTP连接ss -x src /tmp/.X11-unix/* 找出所有连接X服务器的进程ss -s 列出当前socket详细信息:

# ss -sTotal: 3519 (kernel 3691)TCP: 26557 (estab 3163, closed 23182, orphaned 194, synrecv 0, timewait 23182/0), ports 1452
Transport Total IP IPv6* 3691 - -RAW 2 2 0UDP 10 7 3TCP 3375 3368 7INET 3387 3377 10FRAG 0 0 0

当前视图端口

# ss -lRecv-Q Send-Q Local Address:Port Peer Address:Port0 10 :::5989 :::*0 5 *:rsync *:*0 128 :::sunrpc :::*0 128 *:sunrpc *:*0 511 *:http *:*0 128 :::ssh :::*0 128 *:ssh *:*0 128 :::35766 :::*0 128 127.0.0.1:ipp *:*0 128 ::1:ipp :::*0 100 ::1:smtp :::*0 100 127.0.0.1:smtp *:*0 511 *:https *:*0 100 :::1311 :::*0 5 *:5666 *:*0 128 *:3044 *:*

s 最初的每个进程都命名了他们的端口

# ss -pl

# ss -t -a

s 的所有 udp 套接字

# ss -u -a

所有的http连接中的连接

# ss -o state established '( dport = :http or sport = :http )'

• 以上包含访问提供的80，以及外部的80
• 使用更高命令的完美替代 netstat 获取http到常用连接数，监控中

# ss -x src /tmp/.X11-unix/*

# ss -o state fin-wait-1 '( sport = :http or sport = :https )'

ss常用的状态状态：

establishedsyn-sentsyn-recvfin-wait-1fin-wait-2time-waitclosedclose-waitlast-acklistenclosingall : All of the above statesconnected : All the states except for listen and closedsynchronized : All the connected states except for syn-sentbucket : Show states, which are maintained as minisockets, i.e. time-wait and syn-recv.big : Opposite to bucket state.

ss使用IP地址筛选

ss src ADDRESS_PATTERNsrc：表示来源ADDRESS_PATTERN：表示地址规则如下：ss src 120.33.31.1 # 列出来之20.33.31.1的连接
＃　列出来至120.33.31.1,80端口的连接ss src 120.33.31.1:httpss src 120.33.31.1:8

ss使用端口筛选

ss dport OP PORTOP:是运算符PORT：表示端口dport：表示过滤目标端口、相反的有sport

操作类型：

<= or le : 小于等于 >= or ge : 大于等于== or eq : 等于!= or ne : 不等于端口< or lt : 小于这个端口 > or gt : 大于端口

OP实例

ss sport = :http 也可以是 ss sport = :80ss dport = :httpss dport \> :1024ss sport \> :1024ss sport \< :32000ss sport eq :22ss dport != :22ss state connected sport = :httpss \( sport = :http or sport = :https \)ss -o state fin-wait-1 \( sport = :http or sport = :https \) dst 192.168.

# ss -hUsage: ss [ OPTIONS ]ss [ OPTIONS ] [ FILTER ]-h, --help           this message-V, --version        output version information-n, --numeric        don't resolve service names-r, --resolve       resolve host names-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        show socket usage summary-4, --ipv4          display only IP version 4 sockets-6, --ipv6          display only IP version 6 sockets-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 display sockets of type FAMILY-A, --query=QUERY, --socket=QUERYQUERY := {all|inet|tcp|udp|raw|unix|packet|netlink}[,QUERY]-D, --diag=FILE      Dump raw information about TCP sockets to FILE-F, --filter=FILE   read filter information from FILEFILTER := [ state TCP-STATE ] [ EXPRESSION ]

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