Linux-ss命令

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socket
ss -t -a 显示所有tcp socket
ss -u -a 显示所有的UDP Socekt
ss -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:
解释：netstat是遍历/proc下面每个PID目录，ss直接读/proc/net下面的统计信息。所以ss执行的时候消耗资源以及消耗的时间都比netstat少很多

Usage: 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        QUERY := {all|inet|tcp|udp|raw|unix|packet|netlink}[,QUERY]    -F, --filter=FILE   read filter information from FILE        FILTER := [ state TCP-STATE ] [ EXPRESSION ]