/usr/local/bin/space-checker

space-checker

#!/bin/bash

#   .  .:free space checker:.
#  -o-                   
#   '           .-.                      .
#            __/ @_\_     .  *          -o-  
#           (________)                   ' 
#
#        *              |
# .                   --o--
#           .           |
#               
#     

ADMIN="me@example.com"
ALERT=95

FREE=`df -Ph . | awk 'NR==2 {print $5}' | cut -d'%' -f1`

echo ${FREE}% free space on $(hostname).

if [[ $FREE -gt $ALERT ]]; then
  SUBJECT="More than ${ALERT}% disk usage. ${FREE}% free space left."
  echo $SUBJECT
  echo "$(hostname) (/usr/local/bin/space-checker) : $SUBJECT" | mail -s "$SUBJECT" $ADMIN
  exit 1
fi