获得某个用户的某个进行的信息：

　　function GetPID #user #name { PsUser=$1 #echo $PsUser PsName=$2 #echo $PsName pid=`ps -u $PsUser | grep $PsName | grep -v grep | grep -v vi | grep -v dbx\n | grep -v tail | grep -v start | grep -v stop | sed -n 1p | awk '{print $1}'` echo $pid } PID=`GetPID lgy cat` echo $PID #The process does not exist. if [ "-$PID" == "-" ] then { echo "The process does not exist." } fi

　　这里面涉及一些最基本的进程监控命令，在linux中你只要man ps就会得到很多使用说明，grep按照一定的匹配规则进行字符串分割匹配，还有一些简单的控制语句，这些基本的shell语法应该是我们的基本技能，在晚上会有很多的学习资料。

　　获得CPU的使用率：

　　function GetCPU { CPUValue=`ps -p $1 -o pcpu | grep -v CPU | awk '{print $1}' | awk -F. '{print $1}'` echo $CPUValue } function CheckCPU { PID=$1 cpu=`GetCPU $PID` if [ $cpu -gt 80 ] then { echo "The usage of cpu is larger than 80%" } else { echo "The usage of cpu is normal" } fi } CheckCPU $PID

　　这个程序和上一个代码片段是一脉相承，本段代码的运行结果一会会有相应的展示!

　　这段脚本的主要目的是用来进行对某个进程的内存使用情况的检测：

　　function GetMem { MemUsage=`ps -o vsz -p $1 | grep -v VSZ` ((MemUsage /= 1024)) echo $MemUsage } mem=`GetMem $PID` if [ $mem -gt 1600 ] then { echo "The usage of memory is larger than 1.6G" } else { echo "The usage of memory is normal" } fi

　　这是用来进行获得此进程的句柄使用量：

　　function GetDes { DES=`ls /proc/$1/fd | wc -l` echo $DES } des=`GetDes $PID` if [ $des -gt 900 ] then { echo "The number of des is larger than 900" } else { echo "The number of des is normal" } fi

　　进行对某个端口的绑定的查询：

　　function Listening { TCPListeningNum=`netstat -an | grep ":$1 " | awk '$1 == "tcp" && $NF == "LISTEN" {print $0}' | wc -l` UDPListenNum=`netstat -an | grep ":$1 " | awk '$1 == "udp" && $NF == "0.0.0.0:*" {print $0}' | wc -l` ((ListeningNum = TCPListeningNum + UDPListenNum )) if [ $ListeningNum == 0 ] then { echo "0" } else { echo "1" } fi } isListen=`Listening 8080` if [ $isListen -eq 1 ] then { echo "The port is listening" } else { echo "The port is not listening" } fi

　　系统CPU的使用情况：

　　function GetSysCPU { CPUIdle=`vmstat 1 5 | sed -n '3,$p' | awk '{xx = x + $15} END {print x/5}' | awk -F. '{print $1}'` CPUNum=`echo "100-$CPUIdle" | bc` echo $CPUNum } cpu=`GetSysCPU` echo "The System CPU is $cpu" if [ $cpu -gt 90 ] then { echo "The usage of system cpu is larger than 90%" } else { echo "The usage of system cpu is normal" } fi

　　获得某制定的磁盘空间：

　　function GetDiskSpc { if [ $# -ne 1 ] then return 1 fi Folder="$1$" DiskSpace=`df -k | grep $Folder | awk '{print $5}' | awk -F% '{print $1}'` echo $DiskSpace } Folder="/dev" DiskSpace=`GetDiskSpc $Folder` echo "The system $Folder disk space is $DiskSpace%" if [ $DiskSpace -gt 90 ] then { echo "The usage of system disk($Folder) is larger than 90%" } else { echo "The usage of system disk($Folder) is normal" } fi

　　在本机上代码检测的结果如下：

　　lgy@lgy-HP:~$ ./monitorCPU.sh 2388 The usage of cpu is normal The usage of memory is normal The number of des is normal The port is not listening The System CPU is 1 The usage of system cpu is normal The system /dev disk space is 1% The usage of system disk(/dev) is normal