Shell Programming and Scripting

if [ $usep -ge $ALERT ]; then

#!/bin/bash
# comment
ADMIN="(I have an email address here)"
ALERT=90
df -H | grep -vE '^none' | 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

# First declare usep as an integer
typeset -i usep 
usep=$(echo $output | awk ' { print $1 }' | cut -d'%' -f1 )

#!/bin/ksh
# comment
ADMIN="(I have an email address here)"
ALERT=90
df -H | grep -vE '^none' | 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