I have a shell script that backups a database, 7zips it, and uploads to my Amazon s3 account. It works if I run the shell script, but as a cronjob it stops after it dumps the database (doesn't continue on to 7zip). Can anybody see what I am doing wrong here?

Here is the line in my crontab:

59 2 * * 0 cd / && ./mysqlbackup.sh >/dev/null 2>&1

Here is mysqlbackup.sh :

!/bin/sh

DMPFILE=fc$(date +"%Y%m%d").dmp BACKUPFILE=fc$(date +"%Y%m%d").7z

# Dump Database mysqldump --quick --add-drop-table --add-locks --extended-insert --lock-tables --opt -u **** -p**** database_name > $DMPFILE

# Zip Dump

7za a $BACKUPFILE $DMPFILE

# Upload Zip

MONTH=$(date +"%Y%m")

sudo s3cmd put $BACKUPFILE s3://fcmysqlbackup/$MONTH/$DMPFILE

# Delete Local Dump and Zip

sudo rm $DMPFILE $BACKUPFILE