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        1.脚本如下~
- #!/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
 
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