Bash Script: Send files to SFTP using Expect

Shell Programming and Scripting
1

I have to send few gzipped files from local server to SFTP server.

My Server Info

Distributor ID: Ubuntu Description: Ubuntu 12.04.4 LTS Release: 12.04 Codename: precise

Created a bash script and could able to send files to sftp, but i want to send email if transfer is successful.

#!/bin/bash</code>
 HOST=hostname.domain
 PORT=22
 USER=username
 PASSWORD=password
 SOURCE_FILE=path/filename
 TARGET_DIR=PATH

 /usr/bin/expect<<EOD

 spawn /usr/bin/sftp -o Port=$PORT $USER@$HOST
 expect "password:"
 send "$PASSWORD\r"
 expect "sftp>"
 send "put $SOURCE_FILE $TARGET_DIR\r"
 expect "sftp>"
 send "bye\r"
 EOD

Now i want if the above transfer is successfull send Success Email if not Failure email with error message.

Please help!!

Thanks.

2 
/usr/bin/expect<<EOD > output.log
spawn /usr/bin/sftp -o Port=$PORT $USER@$HOST
expect "password:"
send "$PASSWORD\r"
expect "sftp>"
send "put $SOURCE_FILE $TARGET_DIR\r"
expect "sftp>"
send "bye\r"
EOD
RC=$?
if [[ ${RC} -ne 0 ]]; then
  cat output.log | mail -s "Errors Received" "email@domain.com"
else
  echo "Success" | mail -s "Transfer Successful" "email@domain.com"
fi