linux--常用shell脚本

1、侦测程序句柄泄漏

#对进程采样数据3000次，每次间隔10秒，监控进程打开句柄的情况，
#若出现持续上升的情况，说明进程异常
#!/bin/sh 
set -x 
echo "">total_handler 
 
psid=`ps -ef|grep $1|head -1|awk '{print $2}'` 
count=0 
while [ $count -lt 3000 ] 
do 
 lsof -p $psid|wc -l >> total_handler 
 sleep 10 
 count=`expr $count + 1` 
done

2、检查进程是否存在

#获取PsUser下PsName进程的pid
function GetPID() #User #Name 
{ 
   PsUser=$1 
   PsName=$2 
   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 
}

3、进程CPU占用率

function GetCpu() 
{ 
    PID=$1
    CpuValue=`ps -p $PID -o pcpu |grep -v CPU | awk '{print $1}' | awk -  F. '{print $1}'` 
    echo $CpuValue 
}

4、内存使用情况

function GetMem() 
{ 
    PID=$1
    MEMUsage=`ps -o vsz -p $PID|grep -v VSZ` 
    (( MEMUsage /= 1000)) 
    echo $MEMUsage 
}

5、进程使用数量

function GetDes() 
{ 
    PID=$1
    DES=`ls /proc/$PID/fd | wc -l` 
    echo $DES 
}

6、TCP/UDP端口是否在被监听

function Listening()
{ 
   port=$1
   TCPListeningnum=`netstat -an | grep ":$port " | \n
   awk '$port == "tcp" && $NF == "LISTEN" {print $0}' | wc -l` 
   UDPListeningnum=`netstat -an|grep ":$port " \n
   |awk '$port == "udp" && $NF == "0.0.0.0:*" {print $0}' | wc -l` 
   (( Listeningnum = TCPListeningnum + UDPListeningnum )) 
   if [ $Listeningnum == 0 ] 
   then 
   { 
       echo "0"
   } 
   else 
   { 
      echo "1"
   } 
   fi 
}

7、cpu负载

function GetSysCPU 
{ 
  CpuIdle=`vmstat 1 5 |sed -n '3,$p' \n
  |awk '{x = x + $15} END {print x/5}' |awk -F. '{print $1}'
  CpuNum=`echo "100-$CpuIdle" | bc` 
  echo $CpuNum 
}

8、磁盘使用情况

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 
}