查看服务器网络连接数

源：http://my.oschina.net/shineyyl/blog/125540
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