查看服务器网络连接数

评：


$ netstat -ant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:640 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8001 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:2049 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:612 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3333 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:873 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:682 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:54927 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 10.18.105.11:60920 10.18.105.11:3306 ESTABLISHED
tcp 0 0 127.0.0.1:80 127.0.0.1:39949 TIME_WAIT
tcp 0 0 10.18.105.11:22 10.18.105.228:53750 ESTABLISHED
tcp 0 0 10.18.105.11:22 10.18.105.228:61598 ESTABLISHED
tcp 0 0 10.18.105.11:3306 10.18.105.11:60920 ESTABLISHED
tcp 0 0 10.18.105.11:22 10.18.105.228:50195 ESTABLISHED
tcp 0 0 10.18.105.11:22 10.18.105.67:52151 ESTABLISHED


$ netstat -ant |awk '/^tcp/ {++state[$6]} END {for(key in state) printf("%-10s\t%d\n",key,state[key])}'
TIME_WAIT 1
ESTABLISHED 6
LISTEN 15