查看linux网络连接 连接总数

查看系统tcp连接中各个状态的连接数。
 
netstat -an | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
查看和本机80端口建立连接并状态在established的所有ip
 

netstat -an |grep 80 |grep ESTA |awk '{print$5 "/n"}' |awk 'BEGIN {FS=":"} {print $1 "/n"}' |sort |uniq
输出每个ip的连接数，以及总的各个状态的连接数。
 

netstat -n | awk '/^tcp/ {n=split($(NF-1),array,":");if(n<=2)++S[array[(1)]];else++S[array[(4)]];++s[$NF];++N} END {for(a in S){printf("%-20s %s/n", a, S[a]);++I}printf("%-20s %s/n","TOTAL_IP",I);for(a in s) printf("%-20s %s/n",a, s[a]);printf("%-20s %s/n","TOTAL_LINK",N);}'