Shell Programming and Scripting

# set admin email so that you can get email
ADMIN=someone@somewhere.com
host=`hostname`
date=`date`
# set alert level 70% is default
ALERT=70
df -h | grep / | grep -v '^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 ($usep%)\" on "$host" as on "$date |
     mailx -s "Alert: Almost out of disk space $usep" $ADMIN
  fi
done

df -h | grep / | grep -v '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;

$ df -h | awk -v "alert=70" '$1 !~ /cdrom|tmpfs/ && 0+$5>alert {print $5, $1 }' |
> while read usep partition; do echo "$partition is $usep full"; done

/dev/xvda2 is 99% full