df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
echo $output
## subject còn 1 đoạn echo ở đây nữa
usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1 )
partition=$(echo $output | awk '{ print $2 }' )
if [ $usep -ge 44 ]; then
# (echo "Subject: Alert: Almost out of disk space $usep%";echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" | /opt/zimbra/postfix/sbin/sendmail -t < subject.txt
/opt/zimbra/postfix/sbin/sendmail -t < subject.txt
fi
done
 

[root@webmail tam]# cat subject.txt
to:abc@gmail.com
Subject: Alert: Almost out of disk space 74%
Body: Alert: Almost out of disk space 74%
 

df -H | grep -vE '^Filesystem|tmpfs|cdrom' | 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 90 ]; then
(echo "Subject: Alert: Almost out of disk space $usep%";echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
/opt/zimbra/postfix/sbin/sendmail abc@gmail.com
fi
done