为Nagios定义自定义脚本检测内存状态

#!/bin/bash #========================================= #File:      check_vm.sh #Description: #Author:    smileliuyb #Modify:    smileliuyb #Creation Date: 2013-1-14 #Last Modified: 2013-1-14 #=========================================  #======check-arg===============if [[ $4 != "" ]];then     echo $2 $4 | awk '$1 !~ /^[0-9]*[0-9,M,m,G,g]$/ || $2 !~ /^[0-9]*[0-9,m,g,M,G]$/{print "User like ./check_vm.sh -w freememory[M,G] -c freememory[M,G]";exit 3}'     if [ $? -eq 3 ];then         exit 3     fi     if [[ $1 == '-w' ]] && [[ $3 == '-c' ]];then         warning=`echo $2 | awk '$1 ~ /[0-9]$/{print $1};$1 ~ /[m,M]$/{print $1*1024};$1 ~ /[g,G]$/{print $1*1024*1024}'`         critical=`echo $4 | awk '$1 ~ /[0-9]$/{print $1};$1 ~ /[m,M]$/{print $1*1024};$1 ~ /[g,G]$/{print $1*1024*1024}'`     elif [[ $1 == '-c' ]] && [[ $3 == '-w' ]];then         warning=`echo $4 | awk '$1 ~ /[0-9]$/{print $1};$1 ~ /[m,M]$/{print $1*1024};$1 ~ /[g,G]$/{print $1*1024*1024}'`         critical=`echo $2 | awk '$1 ~ /[0-9]$/{print $1};$1 ~ /[m,M]$/{print $1*1024};$1 ~ /[g,G]$/{print $1*1024*1024}'`     else         echo "User like ./check_vm.sh -w freememory[M,G] -c freememory[M,G]"         exit 3     fi else     echo "User like ./check_vm.sh -w freememory[M,G] -c free[M,G]"     exit 3 fi  #====see-mem and comparison with arg========freemem=`free -m | cut -d " " -f17` if [ $(( freemem*1024 )) -le $critical ];then     echo "Insufficient memory,Only"$freemem"M are free!"     exit 2 elif [ $(( freemem*1024 )) -le $warning ];then     echo "Memory Warning,Only"$freemem"M are free!"     exit 1 else     echo "Memory OK"     exit 0 fi