查看Linux网络链接及链接总数

netstat -an | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

查看系统tcp链接中各个状态的链接数。

netstat -an |grep 80 |grep ESTA |awk '{print$5 "\n"}' |awk 'BEGIN {FS=":"} {print $1 "\n"}' |sort |uniq

查看和本机80端口创建链接并状态在established的全部ip

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);}'

输出每一个ip的链接数，以及总的各个状态的链接数