TOP相当于Linux下的资源管理器，我们公司有一部分重要的服务器便是通过该命令直接实时监控的。 但是，TOP虽然十分强大，对我们监控却并不是很适合，不能很直观的立刻锁定到重点的数据。更不能利用程序自动完成一些判断了。
因此，我花了一个晚上的时间，完成了下面的这个脚本，只要安装的TOP命令的Linux主机都可以正常使用该脚本！
它目前还是很初级的版本，所以很简单，甚至很弱，但它也实现了以下一些功能：
1.更亲和的人机界面，将重要的数据如CPU，负载，内存百分比等直接输出到平面上；
2.实现了对前一秒的流量统计；
3.更自由的用户自定义选项，可以通过变量来和直接修改脚本来调整排盘和自己的偏好；
4.自动判断功能，当某一项数值出现异常时（依赖于你的预设值），将会现在在顶部有警告信息。
我将会把这一脚本更加的完善，并完成另一份不依赖于TOP指令的脚本（它主要通过常用命令和/proc文件中获取）。
大家任何有需要的可以直接粘贴过去使用，另外，有任何完善的建议的请直接向我提出来，谢谢。
#!/bin/bash
####################################
## System information listen tool v0.2 ######
## powered by mcsrainbow ######
####################################
while true
do
###Copy the top's content to top.info###
top -b1 -n1 >top.info
sleep 2
###Check the flow###
typeset in in_old dif_in
typeset out out_old dif_out
FLOW(){
in_flow1=$(cat /proc/net/dev | grep eth0 | sed -e "s/(.*):(.*)/[1]/g" | awk ' { print $1 }')
in_flow2=$(cat /proc/net/dev | grep eth1 | sed -e "s/(.*):(.*)/[1]/g" | awk ' { print $1 }')
in_flow_byte=$(expr $in_flow1 + $in_flow2)
in_flow=$(expr $in_flow_byte / 1024)
out_flow1=$(cat /proc/net/dev | grep eth0 | sed -e "s/(.*):(.*)/[1]/g" | awk ' { print $9 }')
out_flow2=$(cat /proc/net/dev | grep eth1 | sed -e "s/(.*):(.*)/[1]/g" | awk ' { print $9 }')
out_flow_byte=$(expr $out_flow1 + $out_flow2)
out_flow=$(expr $out_flow_byte / 1024)
}
FLOW
in_old=$in_flow
out_old=$out_flow
sleep 1
FLOW
in=$in_flow
out=$out_flow
dif_in=$(expr $in - $in_old )
dif_out=$(expr $out - $out_old )
###Clear the Screen###
clear
###Define the safe number###
servername=Server #The server's name which you running the scrīpts
maxload=5 #Warning if the load average bigger than this number
maxcpu=50 #Warning if the cpu bigger than is percent
minmem=120 #Warning if the memory less than this number (MB)
minswap=120 #Warning if the swap less than this number (MB)
maxusers=3 #Warning if the user online more than 3
maxzombie=2 #Warning if the zombie process more than 2
###Check the CPU###
cpuinfo=`grep "Cpu(s)" top.info|awk '{print $2}'`
cpuinfonumber=` echo $cpuinfo |awk -F "%" '{print $1}'|awk -F "." '{print $1}'`
if [ ${maxcpu} -lt ${cpuinfonumber} ]
then
echo "!!!!WARNING:The CPU used too much!!!!"
fi
###Check the Mem###
meminfo=`grep "Mem:" top.info|awk '{print $4 "/" $2}'`
usedmem_kb=`grep "Mem:" top.info|awk '{print $4}'|awk -F "k" '{print $1}'`
usedmem_mb=$(expr $usedmem_kb / 1024)
totalmem_kb=`grep "Mem:" top.info|awk '{print $2}'|awk -F "k" '{print $1}'`
totalmem_mb=$(expr $totalmem_kb / 1024)
freemem_mb=$(expr $totalmem_mb - $usedmem_mb)
if [ ${freemem_mb} -lt ${minmem} ]
then
echo "!!!!WARNING:The Memory used too much!!!!"
fi
totalmem_kb_percent=$(expr $totalmem_kb / 100)
percentmem=$(expr $usedmem_kb / $totalmem_kb_percent)
###Check the Swap###
swapinfo=`grep "Swap:" top.info |awk '{print $4 "/" $2}'`
usedswap_kb=`grep "Swap:" top.info |awk '{print $4}'|awk -F "k" '{print $1}'`
usedswap_mb=$(expr $usedswap_kb / 1024)
totalswap_kb=`grep "Swap:" top.info |awk '{print $2}'|awk -F "k" '{print $1}'`
totalswap_mb=$(expr $totalswap_kb / 1024)
freeswap_mb=$(expr $totalswap_mb - $usedswap_mb)
if [ ${freeswap_mb} -lt ${minswap} ]
then
echo "!!!!WARNING:The Swap used too much!!!!"
fi
totalswap_kb_percent=$(expr $totalswap_kb / 100)
percentswap=$(expr $usedswap_kb / $totalswap_kb_percent)
###Check the users online###
useronl=`grep "load average:" top.info |sed 's/user.*//'|awk '{print $(NF)}'`
if [ ${maxusers} -lt ${useronl} ]
then
echo "!!!!WARNING:The User online is more than 3!!!!"
fi
###Check the load average###
loadavg=`grep "load average:" top.info |sed 's/.*load average: //'|awk -F "," '{print $(NF-2)}'`
loadavgnumber=`grep "load average:" top.info |sed 's/.*load average: //'|awk -F "," '{print $(NF-2)}'|awk -F "." '{print $1}'`
if [ ${maxload} -lt ${loadavgnumber} ]
then
echo "!!!!WARNING:The Load Average is more than 5!!!!"
fi
###Check the zombie###
zombie=`grep "Tasks:" top.info |awk '{print $(NF-1)}'`
if [ ${maxzombie} -lt ${zombie} ]
then
echo "!!!!WARNING:The Zombie Process is more than 2!!!!"
fi
###Check the most process###
processtitle=`grep "TIME+" top.info`
processinfo=`sed -n 8p top.info`
###Show me the number just have counted###
echo "Server CPU LOAD ZOMBIE USER IN OUT MEM SWAP "
echo "${servername} ${cpuinfo} ${loadavg} ${zombie} ${useronl} ${dif_in}KB/s ${dif_out}KB/s ${meminfo} ${percentmem}% ${swapinfo} ${percentswap}% "
echo "--------------------------------------------------------------------"
echo "${processtitle}"
echo "${processinfo}"
done
