ADMIN="myemail@someplacecool.com"
# set alert level 90% is default
ALERT=60
df -hl | egrep -ve '/lcl/prd/apps/Tivoli/playground' | 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 $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space $usep" $ADMIN
  fi
done

"test.sh" 14 lines, 586 characters
seville:/lcl/prd/apps/Tivoli/playground>./test.sh
capacity Filesystem
./test.sh: line 10: [: capacity: integer expression expected
81% /dev/md/dsk/d10
0% /devices
0% ctfs
0% proc
0% mnttab
1% swap
0% objfs
0% sharefs
0% fd
1% swap
1% swap
67% /dev/md/dsk/d100

#!/bin/ksh
space=`df -bhk /lcl/prd/apps/Tivoli/playground | cut -d "c" -f1 | awk '{print$5}'`
capacity=${space%?}
echo $capacity
if [ $capacity -gt 70 ]; then
echo "Getting full! $capacity"
else
echo "Below percent trap."
fi