查看TCP状态命令：
[unilife@VM_206_14_centos ~]$ netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}‘
TIME_WAIT 179
CLOSE_WAIT 1
SYN_SENT 1
FIN_WAIT1 181
FIN_WAIT2 4
ESTABLISHED 56986
SYN_RECV 220
LAST_ACK 293
[unilife@VM_206_14_centos ~]$原文：http://12676522.blog.51cto.com/12666522/1923877