#! /bin/sh
#

# Sane default, just in case
[ -z "$CHECK_DISK_PERCENT" ] && CHECK_DISK_PERCENT=90

df -klP |
grep ^/ |
sed -e 's/.*[[:space:]]\([[:digit:]]\+\)%/\1/' |
while read PERC LOCATION; do
 if [ $PERC -gt $CHECK_DISK_PERCENT  ]; then
  echo "Warning on $CHECK_DISK_PERCENT"
  echo "${PERC}% ALERT - $LOCATION"  
 fi
done
