#!/bin/sh
## give max disk usage in %, after that a warning will be produced
 MAX=15
 ## looks for mounted filesystems, but not proc,sys,...
 DISKS=`mount |grep -iv proc |grep -iv sysfs |awk '{print $3}'`

 for DISK in $DISKS; do
         USAGE=`df -k $DISK | tail -n 1 | awk '{print $5}' | cut -d"%" -f1`
         # if no number is given as percentage, do nothing
         echo "$USAGE" |grep -q [0-9] && if [ $USAGE -gt $MAX ]; then
                 echo "`uname -n` $DISK is at ${USAGE}% capacity" | mail -s "[diskspace] $DISK explodiert gleich" root@mutter.sao
         fi
 done