Check disk space

chkdiskspace

#!/bin/bash
MAX=80
EMAIL=email@example.com
HOST=`hostname`
DISKS=`df -h | awk -v max=$MAX 'NR>1 && NF>1 { perc = (NF==5) ? $4 : $5; sub("%","",perc); if (0+perc >= 0+max) print perc"%", $NF }'`

if [ "$DISKS" != "" ]; then
  echo -e "Warning we are running out of disk space on $HOST \n$DISKS" | mail -s "Running out of disk space on $HOST" $EMAIL
fi