shell script to check if sqlite database has changed, and to email the backup file if so

backup.sh

#get the current md5sum, and use awk to strip out filename, which is reuturned as well              
#note, this assumes that md5sum_of_database_at_last_backup.txt exists and contains the hash of db at last backup
#currently no error checking

currentMD5=$(md5sum test.db | awk '{print $1}')
lastMD5=$(cat /home/user/md5sum_of_database_at_last_backup.txt)
 
if [ "$currentMD5" == "$lastMD5" ]
 
then
   echo | mutt email@gmail.com -s "database has not changed since last backup"
 
else
   #update the database                                                                                             
   echo $currentMD5 > /home/user/md5sum_of_database_at_last_backup.txt
 
   #send db as email attachment                                                                                     
   echo | mutt email@gmail.com -a /home/user/test.db -s "daily database backup"
fi
 
unset currentMD5
unset lastMD5