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23端口建立连接并状态在established的所有ip netstat -an |grep 23 |grep ESTA |awk '{print$5 " "}' |awk 'BEGIN {FS=":"} {print $1 " "}' |sort |uniq 输出每个ip的连接数,以及总的各个状态的连接数。 netstat -n | awk '/^tcp/ {n=split($(NF-1),array,":");if(n<=2)++S[array[(1)]];else++S[array[(4)]];++s[$NF];++N} END {for(a in S){printf("%-20s %s ", a, S[a]);++I}printf("%-20s %s ","TOTAL_IP",I);for(a in s) printf("%-20s %s ",a, s[a]);printf("%-20s %s ","TOTAL_LINK",N);}'