#!/bin/sh

warninglimit= 85 
lowlimit= 95 

filesystems="/export /"

for fs in $filesystems
do
        size=`df -k $fs|grep $fs|awk '{ print $5; }'|cut -f1 -d'%'`
        if [ $size -ge $lowlimit ]
        then
                echo |mailx -s "URGENT: Low disk space for $fs ($size)" -r root@host03 root
                echo "URGENT: Low disk space for $fs ($size)"
                break
        fi
        if [ $size -ge $warninglimit ]
        then
                echo | mailx -s "WARNING: Low disk space for $fs ($size)" -r root@host03 root
                echo "WARNING: Low disk space for $fs ($size)"
         fi
done

[root@testdb01 ~]# df -kP
df: unknown option: P
Usage: df [-F FSType] [-abeghklntVvZ] [-o FSType-specific_options] [directory | block_device | resource]
[root@testdb01 ~]# uname -a
SunOS testdb01  5 . 10  Generic_118833- 24  sun4v sparc SUNW,Sun-Fire-T200
[root@testdb01 ~]#

[root@testdb01 ~]# df -k /u01/oradata/orcl|grep /u01|awk '{printf "%d\n",$5}'
 0 
[root@testdb01 ~]# df -k /u01/oradata/orcl|grep /u01|awk '{printf "%s\n",$5}'
 68 %
[root@testdb01 ~]#