nstat是一个简单的监视内核的SNMP计数器和网络接口状态的实用工具。
参数
-h：显示帮助信息；
-V：显示指令版本信息；
-z：显示0计数器；
-r：清零历史统计；
-n：不显示任何内容，仅更新历史；
-a：显示计数器的绝对值；
-s：不更新历史；
-d：以守护进程的方式运行本指令。
实例
[root@localhost database]# nstat
#kernel
IpInReceives 6851 0.0 IpInDelivers 6811 0.0 IpOutRequests 4537 0.0 TcpActiveOpens 118 0.0 TcpEstabResets 3 0.0 TcpInSegs 6709 0.0 TcpOutSegs 4396 0.0 TcpRetransSegs 106 0.0 TcpInErrs 4 0.0 UdpInDatagrams 32 0.0 UdpOutDatagrams 32 0.0 Ip6InReceives 214 0.0 Ip6OutNoRoutes 219 0.0 Ip6InMcastPkts 214 0.0 Ip6InOctets 31894 0.0 Ip6InMcastOctets 31894 0.0 TcpExtTW 33 0.0 TcpExtDelayedACKs 42 0.0 TcpExtDelayedACKLost 36 0.0 TcpExtTCPHPHits 5327 0.0 TcpExtTCPPureAcks 295 0.0 TcpExtTCPHPAcks 47 0.0 TcpExtTCPLossUndo 4 0.0 TcpExtTCPTimeouts 17 0.0 TcpExtTCPDSACKOldSent 36 0.0 TcpExtTCPDSACKRecv 3 0.0 TcpExtTCPAbortOnTimeout 16 0.0 TcpExtTCPSackShiftFallback 3 0.0 TcpExtTCPChallengeACK 4 0.0 TcpExtTCPSYNChallenge 4 0.0 IpExtInMcastPkts 6 0.0 IpExtOutMcastPkts 3 0.0 IpExtInBcastPkts 64 0.0 IpExtInOctets 8859266 0.0 IpExtOutOctets 422403 0.0 IpExtInMcastOctets 192 0.0 IpExtOutMcastOctets 96 0.0 IpExtInBcastOctets 7096 0.0