Mail somebody about space running low in some path (ksh, bash):

PATHS="/export/home /home"
AWK=/usr/bin/awk
DU="/usr/bin/du -ks"
GREP=/usr/bin/grep
DF="/usr/bin/df -k"
TR=/usr/bin/tr
SED=/usr/bin/sed
CAT=/usr/bin/cat
MAILFILE=/tmp/mailviews$$
MAILER=/bin/mailx
mailto="all@company.com"
for path in $PATHS
do
DISK_AVAIL=`$DF $path | $GREP -v "Filesystem" | $AWK '{print $5}'|$SED 's/%//g'`
if [ $DISK_AVAIL -gt 90 ];then
echo "Please clean up your stuff\n\n" > $MAILFILE
$CAT $MAILFILE | $MAILER -s "Clean up stuff" $mailto
fi
done