监控linux disk status

#!/bin/bash
        row=`df -hP|wc -l`
        status=0
        for i in `seq 2 $row`
        do
                spare=`df -hP|sed -n "$i"p|awk '{print $4}'`
                use_percentage=`df -hP|sed -n "$i"p|sed -n "s/\%//"p|awk '{print $5}'`
                spare_percentage=`expr 100 - $use_percentage`
                partition_name=`df -hP|sed -n "$i"p|awk '{print $6}'`
                if [ "$spare_percentage" -lt "3"  ];then
                    echo -n "$partition_name CRITICAL ${spare_percentage}% $spare  "
                    status[$i]=2
                elif [ "$spare_percentage" -lt "5" ];then
                    echo -n  "$partition_name WARNING! ${spare_percentage}% $spare  "
                    status[$i]=1
                else
                    echo -n  "$partition_name OK ${spare_percentage}% $spare  "
                    status[$i]=0
                fi
        done
        zhuangtai=0
        for j in `seq 2 $row`
        do
                if [ "${status[$j]}" -gt "$zhuangtai"  ];then
                    zhuangtai=${status[$j]}
              else
                echo
                  fi
        done
       exit