#!/bin/sh
#set -x
ADMIN="admin@mydomain.com"
ALERT=10
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
  #echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge $ALERT ]; then
    echo "Running out of space \"$partition $usep% used\" on $(hostname) as on $(date)" |
     mail -s "Alert:$(hostname) almost out of disk space $usep% used" $ADMIN
  fi
done

./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
./monitor_EMAIL.sh: line 12: [: /: integer expression expected

[root@s-webservice scripts]# ./monitor_EMAIL.sh
./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
./monitor_EMAIL.sh: line 12: [: /: integer expression expected
[root@host scripts]# vim monitor_EMAIL.sh
[root@host scripts]# ./monitor_EMAIL.sh
+ ADMIN=admin@mydomain.com
+ ALERT=10
+ df -l
+ grep -vE '^Filesystem|tmpfs|cdrom'
+ awk '{ print $5 " " $1 }'
+ read output
++ echo /dev/mapper/VolGroup00-LogVol00
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=/dev/mapper/VolGroup00-LogVol00
++ echo /dev/mapper/VolGroup00-LogVol00
++ awk '{ print $2 }'
+ partition=
+ '[' /dev/mapper/VolGroup00-LogVol00 -ge 10 ']'
./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
+ read output
++ echo / 149186740
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=/
++ echo / 149186740
++ awk '{ print $2 }'
+ partition=149186740
+ '[' / -ge 10 ']'
./monitor_EMAIL.sh: line 12: [: /: integer expression expected
+ read output
++ echo 16% /dev/sda1
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=16
++ echo 16% /dev/sda1
++ awk '{ print $2 }'
+ partition=/dev/sda1
+ '[' 16 -ge 10 ']'
++ hostname
++ hostname
++ date
+ echo 'Running out of space "/dev/sda1 16% used" on host as on Tue Jan  5 12:34:16 SAST 2010'
+ mail -s 'Alert:host almost out of disk space 16% used'
admin@mydomain.com
+ read output