shell脚本监控

#!/bin/bash
# test common.

#warn=$1
#err=$2
#mount=$3

check_val() 
{
    /usr/bin/expr $1 + 100 > /dev/null 2>&1
    return=$(echo $?)

    if [[ ${return} -ne 0 ]]
    then
        echo "please input number."
        exit 1
    fi
}

conf="./check_disk.conf"

if [[ ! -f ${conf} ]]
then
   echo "config file is not exists."
   exit 1
fi


while read line
do
    mount=${line%%=*}
    monitor=${line##*=}
    warn=${monitor%%,*}
    err=${monitor##*,}

    check_val $warn
    check_val $err
    
    #echo "mount: ${mount}; warrn: ${warrn}; err: ${err}"

    #qu ci pan kong jian.
    value=$(df -h | awk ‘{if($NF == "‘"$line"‘") print substr($5,1,length($5)-1)}‘)
    
    if [[ $value -gt ${warn} ]]
    then
        echo "${mount}: disk is full."
        d=$(date +"%s")
        cp /root/shell/log/messages /root/shell/log-bak/messages.${d}
        cat /dev/null > /root/shell/log/messages
    elif [[ $value -gt ${err} ]]
    then
        echo "${mount}: disk is crital."
    else
        echo "${mount}: It‘s normal."
    fi
done<${conf}

/=80,90
/boot=80,90
/dev=80,90
#此文件里的项目可自定义增减