case can determine the range of variable belongs to.
# This script does a very simple test for checking disk space.
space=`df -h | awk '{print $5}' | grep % | grep -v Use | sort -n | tail -1 | cut -d "%" -f1 -`
case $space in
[1-6]*)
Message="All is quiet."
;;
[7-8]*)
Message="Start thinking about cleaning out some stuff. There's a partition that is $space % full."
;;
9[1-8])
Message="Better hurry with that new disk... One partition is $space % full."
;;
99)
Message="I'm drowning here! There's a partition at $space %!"
;;
*)
Message="I seem to be running with an nonexistent amount of disk space..."
;;
esac
echo $Message | mail -s "disk report `date`" anny
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